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Circuit and method for eliminating direct current offset and radio frequency receiving chip

A technology of DC deviation and circuit, which is applied in the circuit of eliminating DC deviation, integrated circuit design, radio frequency receiving chip, and the field of eliminating DC deviation, and can solve the problem of inability to receive signals and so on

Active Publication Date: 2013-11-20
SHANGHAI NATLINEAR ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the signal is processed by the low frequency path, such as figure 1 As shown, after passing through one or more stages of variable amplifiers 3, 5 and channel selection filter 4, the output DC signal is amplified and may reach saturation so that the signal cannot be received

Method used

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  • Circuit and method for eliminating direct current offset and radio frequency receiving chip
  • Circuit and method for eliminating direct current offset and radio frequency receiving chip
  • Circuit and method for eliminating direct current offset and radio frequency receiving chip

Examples

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Embodiment 1

[0069] The invention discloses a circuit for eliminating DC deviation, which is used to compensate the DC voltage difference at both ends of the output signal. The circuit for eliminating DC deviation includes a voltage difference detection unit, a comparison unit, a logic generation unit, and a compensation unit connected in sequence.

[0070] The voltage difference detection unit is used to detect the DC voltage difference at both ends of the output signal; the logic generation unit is used to output the voltage compensation signal. The compensation unit is used for compensating the DC voltage difference according to the output of the logic generating unit. The comparing unit is used for comparing the DC voltage difference with a set standard voltage. The logic generation unit adjusts the voltage compensation signal according to the output of the comparison unit; for example, when the DC voltage difference is lower than the standard voltage, the logic generation unit output...

Embodiment 2

[0091] see figure 2 , this embodiment discloses a radio frequency receiving chip, the radio frequency receiving chip includes a low noise amplifier 11, a mixer 12, a channel selection filter 14, one or more variable amplifiers 13, 15, and includes the first embodiment The circuit 20 for eliminating DC deviation. In this embodiment, the radio frequency receiving chip includes two variable amplifiers 13, 15, which are arranged on both sides of the channel selection filter 14 respectively.

[0092] The low noise amplifier 11 is used to receive and amplify the radio frequency signal entering from the antenna or cable. The mixer 12 is used for receiving the output signal of the low noise amplifier, and mixing the output signal with the signal LO from the oscillator, and converting it to baseband. After the signal passes through the variable amplifiers 13, 15 and the channel selection filter 14, the output DC signal is amplified. The circuit 20 for eliminating DC deviation is us...

Embodiment 3

[0102] The first embodiment uses the comparison circuit 23 to set two standard voltages as an example to introduce the circuit for eliminating the DC deviation of the present invention. Of course, the comparison circuit 23 can also only set a standard voltage.

[0103] (1) When the DC voltage difference is less than the standard voltage, the logic generating unit outputs a signal to increase the compensation voltage;

[0104] (2) When the DC voltage difference is greater than the standard voltage, the logic generating unit outputs a signal for reducing the compensation voltage;

[0105] (3) When the DC voltage difference meets the standard voltage, the logic generation unit does not change, indicating that the logic generation unit has found an appropriate output signal.

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PUM

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Abstract

The invention discloses a circuit and method for eliminating direct current (DC) offset. The circuit comprises an offset detecting unit, a logic generating unit, a compensating unit and a comparing unit, wherein the offset detecting unit is used for detecting the DC offset at the two ends of the output signal; the logic generating unit is used for outputting the voltage compensation signal; the compensating unit is used for compensating the DC offset according to the output of the logic generating unit; the comparing unit is used for comparing the DC offset with the set standard voltage; and the logic generating unit is used for adjusting the voltage compensation signal according to the output of the comparing unit. The circuit and method provided by the invention can compensate the offset of the DC voltage output by a mixer to eliminate the DC offset to be within a certain threshold voltage range.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and relates to a circuit, in particular to a circuit for eliminating DC deviation; the invention further relates to a method for eliminating DC deviation; in addition, the invention also relates to a method including the above-mentioned DC deviation elimination The radio frequency receiving chip of the circuit. Background technique [0002] see figure 1 , the existing radio frequency receiving chip includes a low noise amplifier 1 , a mixer 2 , a variable amplifier 3 , a channel selection filter 4 , and a variable amplifier 5 connected in sequence. [0003] The radio frequency signal enters the low noise amplifier 1 from the antenna or cable, and then to the mixer 2 of the next stage. Mixer 2 mixes the signal with the signal LO from the oscillator and converts it to baseband. Because in the receiver of zero-IF or very low-IF structure, the frequency of LO is equal to or very ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/06
Inventor 裘旭亚刘桂芝吴国平黄年亚蒋小强王冬峰
Owner SHANGHAI NATLINEAR ELECTRONICS CO LTD
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