CN-116137512-B - Variable gain amplifier and transmitting device

Abstract

The disclosure provides a variable gain amplifier, which comprises a voltage signal input end, a high level generation module, a switch signal conversion module and an amplifying module, wherein the high level generation module comprises a first high level signal output end and a second high level signal output end and is used for converting a voltage signal input through the voltage signal input end into a first high level signal and a second high level signal, the switch signal conversion module comprises a high level signal input end, N digital signal input ends and N switch signal output ends, the switch signal conversion module is used for outputting a gain control signal related to a signal output by the high level signal input end through a corresponding switch signal output end under the control of a signal input by the digital signal input end, and the amplifying module comprises an amplifying unit and an N-level gain control unit, wherein N is a positive integer not smaller than 1. The present disclosure also provides a transmitting device.

Inventors

• LIN SIYU

Assignees

• 深圳市中兴微电子技术有限公司

Dates

Publication Date

20260505

Application Date

20211117

Claims (9)

1. 1. A variable gain amplifier, comprising: A voltage signal input terminal; The high-level generating module comprises a first high-level signal output end and a second high-level signal output end, and is used for converting a voltage signal input through the voltage signal input end into a first high-level signal and a second high-level signal, wherein the first high-level signal and the second high-level signal are positively correlated with the temperature of the variable gain amplifier, and the potential of the first high-level signal is higher than that of the second high-level signal; The switching signal conversion module comprises a high-level signal input end, N digital signal input ends and N switching signal output ends, wherein the high-level signal input end is electrically connected with the first high-level signal output end, the N switching signal output ends are in one-to-one correspondence with the N signal input ends, and the switching signal conversion module is used for outputting gain control signals related to signals output by the high-level signal input ends through the corresponding switching signal output ends under the control of signals input by the digital signal input ends; The amplifying module comprises an amplifying unit and N-level gain control units, the N-level gain control units are respectively in one-to-one correspondence with N switch signal output ends of the switch signal conversion module, the control ends of the gain control units are electrically connected with corresponding switch signal output ends, the input ends of the gain control units are electrically connected with the voltage signal input ends, the output ends of the gain control units are electrically connected with intermediate nodes of the amplifying unit, the gain control units can provide voltage signals positively correlated with temperature for the intermediate nodes under the control of signals received by the control ends of the gain control units, the input ends of the amplifying units are electrically connected with the second high-level signal output ends, and the control ends of the amplifying units are electrically connected with the first high-level signal output ends, wherein N is a positive integer not smaller than 1; the switch signal conversion module comprises N switch signal conversion units which are in one-to-one correspondence with N digital signal input ends and in one-to-one correspondence with N switch signal output ends, The control end of the switching signal conversion unit is electrically connected with the corresponding digital signal input end, the input end of the switching signal conversion unit is electrically connected with the first high-level signal end, and the output end of the switching signal conversion unit is electrically connected with the corresponding switching signal output end; the switching signal conversion unit can conduct the input end of the switching signal conversion unit with the output end of the switching signal conversion unit when the control end of the switching signal conversion unit receives the digital signal which is effective to the switching signal conversion unit.
2. 2. The variable gain amplifier of claim 1, wherein the switching signal conversion unit comprises a first switching signal conversion transistor and a second switching signal conversion transistor, a gate of the first switching signal conversion transistor is electrically connected to a gate of the second switching signal conversion transistor and each is electrically connected to a corresponding digital signal input terminal, a first pole of the first switching signal conversion transistor is electrically connected to the first high level signal input terminal, a second pole of the first switching signal conversion transistor is electrically connected to a first pole of the second switching signal conversion transistor, a second pole of the second switching signal conversion transistor is electrically connected to a low level signal reference terminal, one of the first switching signal conversion transistor and the second switching signal conversion transistor is a P-type transistor, and the other of the first switching signal conversion transistor and the second switching signal conversion transistor is an N-type transistor.
3. 3. The variable gain amplifier of claim 2 wherein the first switching signal conversion transistor is a P-type transistor and the second switching signal conversion transistor is an N-type transistor.
4. 4. The variable gain amplifier of claim 1 wherein the high level generation module comprises: a current source, an input end of which is formed as a voltage input end, the current source being capable of converting a voltage signal input by the voltage input end into a current, and the current being positively correlated with a temperature of the variable gain amplifier; The input end of the current conversion unit is electrically connected with the output end of the current source, the first output end of the current conversion unit is formed into a first high-level signal output end, the second output end of the current conversion unit is formed into a second high-level signal output end, and the current conversion unit is used for respectively converting the current into a first high-level signal and a second high-level signal, outputting the first high-level signal through the first output end and outputting the second high-level signal through the second output end.
5. 5. The variable gain amplifier of claim 4 wherein the high level generation module comprises a first current conversion transistor and a second current conversion transistor; The grid electrode of the first current conversion transistor is electrically connected with the first electrode of the first current conversion transistor and is formed into an input end of the high level generation module, and the first output end is electrically connected with the first electrode of the first current conversion transistor; The grid electrode of the second current conversion transistor is electrically connected with the first electrode of the second current conversion transistor, and is electrically connected with the second electrode of the first current conversion transistor, the second output end is electrically connected with the first electrode of the second current conversion transistor, and the second electrode of the second current conversion transistor is electrically connected with the low-level signal reference end.
6. 6. The variable gain amplifier of any one of claims 1 to 5, wherein the gain control unit comprises a gain transistor, a gate of the gain transistor being formed as a control terminal of the gain control unit, a first pole of the gain transistor being electrically connected to the voltage signal input terminal, and a second pole of the gain transistor being formed as an output terminal of the gain control unit.
7. 7. The variable gain amplifier of any one of claims 1 to 5, wherein the amplifying unit comprises a first amplifying transistor and a second amplifying transistor, a gate of the first amplifying transistor being formed as a control terminal of the amplifying unit, a first pole of the first amplifying transistor being electrically connected to an output terminal of the amplifying unit, a second pole of the first amplifying transistor being electrically connected to an intermediate node; The grid electrode of the second amplifying transistor is formed as an input end of the amplifying unit, the first electrode of the second amplifying transistor is electrically connected with the second electrode of the amplifying transistor, and the second electrode of the second amplifying transistor is electrically connected with the low-level signal reference end.
8. 8. The variable gain amplifier of claim 7 wherein the amplifying unit further comprises a resistive element having one end electrically connected to the voltage signal input and the other end electrically connected to the first pole of the first amplifying transistor.
9. 9. A transmitting device comprising an intermediate frequency variable gain amplifier, a mixer, a radio frequency variable gain amplifier and a power amplifier connected in sequence, wherein at least one of the intermediate frequency variable gain amplifier and the radio frequency variable gain amplifier is the variable gain amplifier of any one of claims 1 to 8.

Description

Variable gain amplifier and transmitting device Technical Field The present disclosure relates to the field of communication devices, and in particular, to a variable gain amplifier and a transmitting apparatus including the variable gain amplifier. Background The variable gain amplifier is an important component of the transceiver system, and common variable gain amplifiers include a variable gain amplifier with a digital current steering structure, a variable gain amplifier with an analog current steering structure, and a variable gain amplifier with a digital step attenuator structure. Among them, the variable gain amplifier having the digital current steering structure is most widely used, but the gain step and the maximum gain of the variable gain amplifier having the digital current steering structure are greatly affected by the temperature and the process angle, so that the error of the variable gain amplifier having the digital current steering structure is also different according to the temperature and the process angle. Disclosure of Invention The disclosed embodiments provide a variable gain amplifier and a transmitting apparatus including the same. As a first aspect of the present disclosure, there is provided a variable gain amplifier comprising: A voltage signal input terminal; The high-level generating module comprises a first high-level signal output end and a second high-level signal output end, and is used for converting a voltage signal input through the voltage signal input end into a first high-level signal and a second high-level signal, wherein the first high-level signal and the second high-level signal are positively correlated with the temperature of the variable gain amplifier, and the potential of the first high-level signal is higher than that of the second high-level signal; The switching signal conversion module comprises a high-level signal input end, N digital signal input ends and N switching signal output ends, wherein the high-level signal input end is electrically connected with the first high-level signal output end, the N switching signal output ends are in one-to-one correspondence with the N signal input ends, and the switching signal conversion module is used for outputting gain control signals related to signals output by the high-level signal input ends through the corresponding switching signal output ends under the control of signals input by the digital signal input ends; The amplifying module comprises an amplifying unit and N-level gain control units, the N-level gain control units are respectively in one-to-one correspondence with N switch signal output ends of the switch signal conversion module, the control ends of the gain control units are electrically connected with corresponding switch signal output ends, the input ends of the gain control units are electrically connected with voltage signal input ends, the output ends of the gain control units are electrically connected with intermediate nodes of the amplifying unit, the gain control units can provide voltage signals positively correlated with temperature for the intermediate nodes under the control of signals received by the control ends of the gain control units, the input ends of the amplifying units are electrically connected with second high-level signal output ends, and the control ends of the amplifying units are electrically connected with first high-level signal output ends, wherein N is a positive integer not smaller than 1. Optionally, the switching signal conversion module includes N switching signal conversion units, where the N switching signal conversion units are in one-to-one correspondence with the N digital signal input ends, and the N switching signal conversion units are in one-to-one correspondence with the N switching signal output ends, The control end of the switching signal conversion unit is electrically connected with the corresponding digital signal input end, the input end of the switching signal conversion unit is electrically connected with the first high-level signal end, and the output end of the switching signal conversion unit is electrically connected with the corresponding switching signal output end; the switching signal conversion unit can conduct the input end of the switching signal conversion unit with the output end of the switching signal conversion unit when the control end of the switching signal conversion unit receives the digital signal which is effective to the switching signal conversion unit. Optionally, the switching signal conversion unit includes a first switching signal conversion transistor and a second switching signal conversion transistor, where a gate of the first switching signal conversion transistor is electrically connected to a gate of the second switching signal conversion transistor and is electrically connected to the corresponding digital signal input terminal, a first pole of the first switching signal conversion transistor is el