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Transconductance amplifier, analog-to-digital converter and operating method thereof, and current generation method

A differential amplifier and converter technology, applied in the field of transconductance amplifiers, can solve the problems of increasing cost, increasing complexity, increasing power consumption, etc.

Inactive Publication Date: 2009-07-08
CIRRUS LOGIC INT SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increases the complexity of the ADC, thereby increasing its cost, and also increases power consumption

Method used

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  • Transconductance amplifier, analog-to-digital converter and operating method thereof, and current generation method
  • Transconductance amplifier, analog-to-digital converter and operating method thereof, and current generation method
  • Transconductance amplifier, analog-to-digital converter and operating method thereof, and current generation method

Examples

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Embodiment Construction

[0059] first reference Figure 3a , which shows a schematic circuit diagram of the differential amplifier 300 . An input voltage Vin is provided on line 302 and a reference voltage Vref is provided on line 304 . The input sampling capacitor C1 306 has one plate coupled to a pair of switches S1 308, S2 310, which connect the lines 302, 304 to the capacitor 306, respectively. Switches 308 and 310 may be controlled to allow line 302 or line 304 to be connected to input sampling capacitor 306 and may comprise MOSFET or FET switches. Technicians will understand that Figure 3a The illustration of switches 308 and 310 is schematic and other functionally equivalent switch configurations may be employed.

[0060] The other plate of input sampling capacitor 306 is coupled to the inverting input of differential transconductance amplifier 312 , which provides a current output Iout on line 314 . A third switch 316 is connected between the output line 314 and a node X 318 between the i...

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Abstract

The present invention relates to transconductance amplifiers, in which the output current is related to the difference between two input voltages, and to the use of such transconductance amplifiers in analog-to-digital converters. The differential amplifier (300) is configured to provide an output current related to a difference between a first input voltage (302) and a second input voltage (304). The differential amplifier includes an input sampling capacitor (318) coupled to a first conductor of the input sampling capacitor; a current output (314) for generating the output current; and input switches (308, 310) for for selectively coupling a second conductor of the input sampling capacitor to a first input of the differential amplifier for receiving the first input voltage and to a second input of the differential amplifier for receiving the first Two input voltages. The differential amplifier is configured to couple the second conductor to one of the first and second inputs and apply a voltage to the first conductor in a first state, and to couple the second conductor to the first conductor in a second state. The second conductor is coupled to the other of the first and second inputs to provide a voltage change to the transconductance amplifier input based on the difference between the first and second input voltages.

Description

technical field [0001] The present invention relates generally to transconductance amplifiers, ie, amplifiers that generate an output current in response to an input voltage, and to analog-to-digital converters (ADCs) employing such amplifiers. More specifically, the present invention relates to transconductance amplifiers in which the output current depends on the difference between two input voltages, and to applications thereof. Background technique [0002] In many ADC designs, an analog input voltage is compared to a reference voltage (or multiple reference voltages) to produce a voltage output that can be used to generate a digital output code. Exemplary voltage comparators are described in US 6,150,851, US 6,356,148, US 6,249,181 and D.R. Beck and D.J. Allstot, "An 8-bit, 1.8V, High Speed ​​Analogue-to-digital Converter" ( http: / / students.washington.edu / beckdo / Dapers / techcon2000.doc ) and P. Setty, J. Barner, J. Plany, H. Burger, and J. Sonntag, "A5.75b 350MSamples / S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/00H03F3/45H03M1/16H03M1/36
CPCH03M1/361H03F3/45475H03F3/005H03M1/167
Inventor 爱德华·梅杰·格兰维尔
Owner CIRRUS LOGIC INT SEMICON