Low-power consumption programmable gain amplifier device

A technology of gain amplifier and programming gain, which is applied in differential amplifiers, DC-coupled DC amplifiers, and improved amplifiers to improve efficiency. The effect of build time

Active Publication Date: 2011-05-25
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DC offset voltage is a serious problem inherent in zero-IF receive mode
In addition, since the above-mentioned standard modes are mostly used in handheld devices, the requirements for power consumption are quite stringent

Method used

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  • Low-power consumption programmable gain amplifier device
  • Low-power consumption programmable gain amplifier device
  • Low-power consumption programmable gain amplifier device

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Embodiment Construction

[0033] Such as figure 1 as shown, figure 1 The block diagram of the programmable gain amplifier device provided by the present invention, this device comprises: the first add-subtractor 10 and the second add-subtractor 11, variable gain amplifier 12, high-pass filter 13, low-pass filter 14, digital control Device 15.

[0034] The first adder-subtractor 10 and the second adder-subtractor 11 add and subtract the input signal and the feedback signal output by the low-pass filter 14, because what the low-pass filter 14 outputs is a low-frequency component, this component and the low-frequency component of the input After addition and subtraction, the DC offset voltage can be eliminated. The output signal of the variable gain amplifier 12 enters the high-pass filter 15, and the high-pass filter can directly filter out the low-frequency components, so it can also eliminate the DC offset voltage, so that the post-processing circuit will not be saturated due to the excessive DC offs...

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PUM

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Abstract

The invention discloses a low-power consumption programmable gain amplifier. The low-power consumption programmable gain amplifier comprises a first adder subtracter and a second adder subtracter, wherein the first adder subtracter and the second adder subtracter are used for performing addition and subtraction operations on an input signal and a feedback signal; a direct-current component and a direct-current misalignment voltage can be eliminated after adding and subtracting; the two input ends of a variable gain amplifier are respectively connected with the output ends of the first adder subtracter and the second adder subtracter; the input end of a high-pass filter is connected with the output end of the variable gain amplifier; the two output ends of low-pass filter are respectively connected with the input ends of the first adder subtracter and the second adder subtracter; the input end of the low-pass filter is connected with the output end of the variable gain amplifier; the low-pass filter is used for generating a low-pass off frequency to form a high-pass characteristic in a feedback circuit, so that the direct-current misalignment voltage can be eliminated; and the output end of a digital controller is respectively connected with the input ends of the variable gain amplifier, the high-pass filter and the low-pass filter, and is used for providing digital control signals for the variable gain amplifier, the high-pass filter and the low-pass filter.

Description

technical field [0001] The invention relates to the technical field of gain amplifier devices, in particular to the field of low power consumption programmable gain amplifier integrated circuits. Background technique [0002] Traditional radio receivers are highly dependent on hardware, and there are defects such as long cycle and high cost for hardware platform function expansion and improvement, and poor interoperability and signal adaptability between various communication systems. The emergence of SDR (Software-Defined Radio) overcomes these defects of traditional hardware radio receivers, provides a feasible solution to existing problems, and creates new ideas and methods for the design and implementation of multifunctional radio communication systems. Broad development prospects. SDR can include a variety of standards and modes, such as GSM, TD-SCDMA, WCDMA, CDMA2000, WLAN, etc. These standards have different requirements for bandwidth, gain, noise, linearity, and pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20H03F3/45H03F1/02
Inventor 李国锋吴南健
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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