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A DC-blocking Capacitor Compensation System for Zero-IF Receivers

A zero-IF receiver and DC-blocking capacitor technology, applied in the transmission system, electrical components, etc., can solve the problems of passive components that are difficult to integrate and filter out the DC component, and achieve convenient filter high-pass inflection point modification, accurate equivalent resistance and The effect of controllable and reduced layout area

Active Publication Date: 2022-07-08
成都通量科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a DC blocking capacitor compensation system suitable for zero-IF receivers, which solves the problem that zero-IF receivers are difficult to integrate passive components for filtering DC components

Method used

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  • A DC-blocking Capacitor Compensation System for Zero-IF Receivers
  • A DC-blocking Capacitor Compensation System for Zero-IF Receivers
  • A DC-blocking Capacitor Compensation System for Zero-IF Receivers

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Embodiment Construction

[0037] The specific embodiments of the present invention are described below to facilitate those skilled in the art to understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes Such changes are obvious within the spirit and scope of the present invention as defined and determined by the appended claims, and all inventions and creations utilizing the inventive concept are within the scope of protection.

[0038] like figure 1 As shown, the DC blocking capacitor compensation system suitable for a zero-IF receiver includes a first chopper operational amplifier module, a second chopper operational amplifier module, an operational amplifier and a switched capacitor integrator; two of the first chopper operational amplifier module The output terminals of the second circuit are respectively connected to the two input terminals of the second chopp...

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Abstract

The invention discloses a DC blocking capacitor compensation system suitable for a zero intermediate frequency receiver, which comprises a first chopper operational amplifier module, a second chopper operational amplifier module, an operational amplifier and a switched capacitor integrator. The invention chops and amplifies the signal twice through the first chopper operational amplifier module and the second chopper operational amplifier module, and can chop the offset voltage and flicker noise of the operational amplifier itself once, so that the signal and the operational amplifier can be chopped once. The DC offset and flicker noise are separated, and the offset and noise are filtered out without affecting the original signal; at the same time, a low-pass filter with a bandwidth of only 10Hz is realized through the switched capacitor integrator, and the negative feedback of the switched capacitor integrator realizes the DC The signal is restrained, and the compensation effect of the large capacitance is obtained. Therefore, the system only increases a small amount of power consumption and area to achieve the effect of adding a large DC blocking capacitor off-chip, and can realize the full integration of the zero-IF receiver.

Description

technical field [0001] The invention relates to the field of circuit signal processing, in particular to a DC blocking capacitor compensation system suitable for a zero intermediate frequency receiver. Background technique [0002] Due to insufficient isolation between the local oscillator end and the RF end of the mixer in the zero-IF receiving chain, the local oscillator signal is fed through to the RF end and then mixed with the local oscillator to generate a DC level (transceiver isolation in the zero-IF receiver). If the degree is not enough, the transmitting signal enters the receiving chain and is mixed with the local oscillator signal to generate DC). After the larger DC signal is amplified by the intermediate frequency amplifier, the output of the amplifier will be saturated, making it unable to work. The traditional technology of eliminating the DC component of the mixer is to use passive components to filter, such as using a large capacitor and the input impedanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16
CPCH04B1/16
Inventor 于松立盛亮亮
Owner 成都通量科技有限公司
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