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Three-order low-pass Gm-C filter for multi-mode zero intermediate frequency receiver

A zero-IF receiver and filter technology, applied in the field of filters, can solve problems such as large parasitic effects, achieve large signal-to-noise ratio, avoid parasitic resistance and switch nonlinear effects

Active Publication Date: 2016-12-07
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the switch is connected in series with the capacitor, there will be a large parasitic effect

Method used

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  • Three-order low-pass Gm-C filter for multi-mode zero intermediate frequency receiver
  • Three-order low-pass Gm-C filter for multi-mode zero intermediate frequency receiver
  • Three-order low-pass Gm-C filter for multi-mode zero intermediate frequency receiver

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Embodiment Construction

[0017] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

[0018] The present invention proposes a third-order low-pass Gm-C filter for a multi-mode zero-IF receiver, and its design idea is to realize wide-range adjustment through an adjustable transconductance amplifier and a switchable transconductance amplifier. Among them, the adjustable transconductance amplifier realizes the continuous adjustment of the cut-off frequency of the filter, which is the fine-tuning mechanism of the filter. The switch transconductance amplifier realizes the discrete adjustment of the cut-off frequency of the filter, which is the coarse adjustment mechanism of the filter.

[0019] Such as figure 2 As shown, the present invention proposes a third-...

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Abstract

The present invention discloses a three-order low-pass Gm-C filter for a multi-mode zero intermediate frequency receiver. The filter comprises a first transconductance amplifier module, a second transconductance amplifier module and eight switches. The first transconductance amplifier module and the second transconductance amplifier module are connected in parallel. The first transconductance amplifier module comprises six transconductance amplifiers and six capacitance modules. The second transconductance amplifier module comprises six transconductance amplifiers. When the switch controls the first and the second transconductance amplifier modules to disconnect, the filter of the present invention works in a low frequency adjustment mode; and when the switch controls the second transconductance amplifier module and the first transconductance amplifier module to connect in parallel, the filter of the present invention works in a high frequency adjustment mode. In adjustment of a cut-off frequency, the filter keeps the capacitance maximum, so that the signal to noise ratio is maximized. In addition, no switch is on a signal path, so that parasite resistance and switch non-linearity are prevented effectively.

Description

technical field [0001] The invention belongs to the field of filters, in particular to a Gm-C filter with a wide adjustment range for a multi-mode zero-IF receiver. Background technique [0002] A filter is a system that removes noise and extracts feature information. It greatly attenuates the signal component (noise) of one frequency, and makes the signal component signal of another frequency pass through smoothly, thereby realizing the function of filtering out noise and extracting target information. Analog filters are divided into passive filters and active filters. Among them, the active filter is widely used because of its small area, low power consumption, and easy integration. Active filters can be divided into Active-RC filters, switched capacitor filters and Gm-C filters. Due to the limitations of operational amplifier gain and bandwidth, Active-RC filters and switched capacitor filters are only suitable for low-IF applications. The Gm-C filter works in an open...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/04
CPCH03H11/0422
Inventor 赵毅强刘银齐束庆冉
Owner TIANJIN UNIV
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