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1-bit cell circuit used in a pipelined analog to digital converter

An analog-digital, bit-cell technology, applied in the field of 1-bit cell circuits, which can solve problems such as long sampling time

Active Publication Date: 2010-12-29
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this means longer sampling times

Method used

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  • 1-bit cell circuit used in a pipelined analog to digital converter
  • 1-bit cell circuit used in a pipelined analog to digital converter
  • 1-bit cell circuit used in a pipelined analog to digital converter

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Embodiment Construction

[0030] Please refer to Figure 3a ~ Figure 3b , which shows a circuit diagram of a preferred embodiment of the 1-bit cell of the present invention, wherein the 1-bit cell uses a signal-independent reference voltage load circuit. The 1-bit analog-to-digital conversion process includes a first half of the sampling period, a second half of the sampling period and a charge transfer period during a conversion period. Such as Figure 3a As shown, the 1-bit unit ADC acts as a sampling and charge transfer circuit, which includes an operational transconductance amplifier (OTA) 301, six matching capacitors 302-307, eight sampling stage switches 308-315, seven charge transfer stage switches 316 - 322 , two multiplexers 323 and 324 , two latch comparators 337 and 338 and a reference voltage buffer 339 . Such as Figure 3b As shown, a dump circuit of the 1-bit unit includes two multiplexers 330 and 336, two matching capacitors 325 and 331, four sampling stage switches 326-327 and 332-33...

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Abstract

The present invention discloses a 1-bit (cell) circuit used in a pipelined analog to digital converter. The 1-bit cell circuit comprises a reference buffer for providing a reference voltage; a sample and charge transfer circuit for receiving an input signal to generate an output signal; and a dump circuit for dumping said reference voltage; wherein said reference buffer selectively connects to one of said sample and charge transfer circuit and said dump circuit according to said input signal.

Description

technical field [0001] The present invention relates to pipelined analog-to-digital converters, and more particularly to a 1-bit cell circuit for pipelined analog-to-digital converters. Background technique [0002] In a mixed-mode circuit, an analog-digital converter (Analog-Digital-Converter, ADC) is an essential component. Recently, pipeline analog-to-digital converters have been widely adopted due to their simple structure and superior performance. Please refer to figure 1 , which shows a typical architecture of a 1-bit unit of a conventional pipeline ADC. The 1-bit unit has a sampling phase (Sampling Phase) and a charge transfer phase (Charging Phase) in a clock cycle. like figure 1 As shown, the 1-bit unit includes an operational transconductance amplifier (Operational Transconductance Amplifier, OTA) 101, four matching capacitors 102-105, a first group of switches 106-113, a second group of switches 114-121, two multiplex multiplexers 122 and 123 and two latch co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
CPCH03M1/442
Inventor 勃尼特·居涅堤
Owner MEDIATEK INC
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