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High Precision Broadband Programmable Gain Amplifier

A technology of programmable gain and amplifier, applied in amplifiers, differential amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve the problems of reducing the bandwidth of programmable gain amplifiers, etc. Effect of Gain Accuracy

Active Publication Date: 2020-12-15
芯与物(上海)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, making the size of the MOS switch larger will introduce larger parasitic capacitance, thereby reducing the bandwidth of the programmable gain amplifier

Method used

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  • High Precision Broadband Programmable Gain Amplifier
  • High Precision Broadband Programmable Gain Amplifier
  • High Precision Broadband Programmable Gain Amplifier

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] figure 2 An embodiment of the high-precision wideband programmable gain amplifier of the present invention is shown. In this embodiment, the high-precision broadband programmable gain amplifier includes two input resistor arrays 1, two feedback resistor arrays 2, an operational amplifier 3 and a digital control module 4, and the digital control module 4 is connected to each input resistor array 1 respectively. , each feedback resistor array 2 is electrically connected. The operational amplifier 3 includes two input and output interfaces. Each input and output interface includes an inpu...

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Abstract

The invention discloses a high precision broadband programmable gain amplifier comprising two input resistor arrays, two feedback resistor arrays, an operational amplifier and a digital control module, wherein the digital control module is electrically connected with each input resistor array and each feedback resistor array; the operational amplifier comprises two input / output interfaces, each input / output interface comprises an input end and an output end, the feedback resistor array crosses over the input end and the output end, and the input end is connected with the input resistor array; and each input resistor array comprises two resistors R1 and a CMOS switch SW1 arranged between the two resistors R1, each feedback resistor array comprises N branches connected in parallel, and the i-th branch comprises two resistors Ri and a CMOS switch SWi arranged between the two resistors Ri, i is not more than N and not less than 1, and on resistance of the CMOS switch SWi is RSWi. According to the high precision broadband programmable gain amplifier provided by the invention, gain precision and broadband of the programmable gain amplifier are improved.

Description

technical field [0001] The invention relates to the technical field of amplifiers, in particular to a high-precision broadband programmable gain amplifier. Background technique [0002] In the satellite navigation system, the signal strength received by the receiver may vary greatly. In order to correctly demodulate the satellite signals with different strengths, the gain of the receiver needs to be automatically adjusted according to the signal strength, so that the receiver has the advantage when receiving weak signals. Very high gain and low gain when receiving strong signals. The circuit that realizes this function is an automatic gain control system (AGC, Automatic Gain Control). In the AGC loop, the programmable gain amplifier is the core module. [0003] see figure 1 , figure 1 A schematic diagram of the circuit structure of a conventional programmable gain amplifier is shown. The programmable gain amplifier changes the gain by changing the feedback resistor R2 so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/42H03F3/45H03G3/30
CPCH03F1/42H03F3/45381H03F2200/36H03G3/30
Inventor 不公告发明人
Owner 芯与物(上海)技术有限公司
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