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Dynamic switch driver for low-distortion programmable-gain amplifier

A buffer amplifier and switch technology, which is applied in the direction of amplification control, control of parts of the amplification device, electronic switches, etc., and can solve the problems of applying large voltage and not allowing it

Active Publication Date: 2015-01-07
THAT PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another aspect of CMOS electronic switches is that modern CMOS processes generally do not allow large voltages to be applied between the switch's gate and channel (source and drain), even for so-called "high voltage" CMOS processes

Method used

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  • Dynamic switch driver for low-distortion programmable-gain amplifier
  • Dynamic switch driver for low-distortion programmable-gain amplifier
  • Dynamic switch driver for low-distortion programmable-gain amplifier

Examples

Experimental program
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Embodiment Construction

[0022] In the attached picture, figure 2 is a schematic diagram of an embodiment of a more area-efficient programmable gain amplifier described in a co-pending application. High Gain Operational Amplifier A 1 is configured as a non-inverting amplifier, the input voltage V IN is applied to the non-inverting input of the amplifier. Resistor R IN Basically sets the input impedance of the amplifier. Resistor R 1 to R N+1 connected in series with amplifier A 1 between the output of the system and the system ground or reference node, and includes a center-tapped resistor string that provides feedback via a series of discrete voltage dividers via an electronic switch S 1 to S N to choose. control signal C C1 to C CN used by opening the electronic switch S 1 to S N to select one of a series of individual closed-loop gain settings such that a single point along the center-tapped resistor string is connected to the inverting input of amplifier A1. In addition, resistor R ...

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PUM

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Abstract

A switching circuit for switching a time-varying input signal, the switching circuit comprising: at least one switch including a N-channel MOSFET and a P-channel MOSFET, each having a gate configured to receive a drive signal to change the ON / OFF state of the switch; and a drive circuit configured and arranged so as to selectively apply a pair of drive signals to change the ON / OFF state of the switch, the drive circuit being configured and arranged to generate the drive signals as a function of (a) a pair DC signal components sufficient to change the ON / OFF state of the switch and (b) a pair of time-varying signal components as at least a partial replica of the signal present on the source terminal of each MOSFET so that when applied with the DC signals to the gates of the n-channel MOSFET and p-channel MOSFET respectively, the drive signals will be at the appropriate level to maintain the ON / OFF state of the switch and keep the gate-source voltages of each MOSFET within the gate-source breakdown limit of the MOSFETs.

Description

[0001] related application [0002] This application is related to and claims US Provisional Patent Application No. 61 / 234,039, filed August 14, 2009, in the name of Gary K. Hebert, and entitled "Dynamic Switch Driver for a Low Distortion Programmable Gain Amplifier" (Attorney Docket No. 56233-411 (THAT-29PR)) and US Provisional Patent Application No. 61 / 234,031 filed August 14, 2009 in the name of Gary K. Hebert and entitled "Area Efficient Programmable Gain Amplifier" Priority of both applications is assigned to the present assignee. This application also relates to and incorporates reference to co-pending application US No.___ (Attorney Docket No. 56233-457 (THAT -28)), which is hereinafter referred to as the "co-pending application", which also claims priority from the provisional application and is assigned to the common assignee together with the present application. technical field [0003] This disclosure generally describes a programmable gain amplifier, and more sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G1/00H03K17/06
CPCH03G1/0088
Inventor G·K·赫伯特
Owner THAT PTY LTD