Reference signal generator and method and system thereof
A technology of reference signal and generator, applied in control/regulation systems, instruments, regulating electrical variables, etc., can solve the problems of increasing chip area, high cost, increasing off-chip devices, etc., to achieve high PSRR value, reduce error, low The effect of output impedance
Active Publication Date: 2013-04-24
HUAWEI TECH CO LTD
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Nevertheless, such techniques may bring high cost of increased chip area, some additional chip pins, increased circuit complexity, and increased off-chip components
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[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0027] A differential reference voltage provided by an embodiment of the present invention may be generated by source follower transistors in an open-loop circuit, and the source follower transistors are biased through a replica-bias circuit. The complex bias circuit includes a differential amplifier and a replica source-follow-follower transistor pair arranged in a feedback loop. A voltage drop circuit (A voltage drop circuit) is electrically connected in series w...
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The invention provides a reference signal generator and a method and a system thereof for generating a differential reference voltage between a first output end and a second output end of the reference signal generator, comprising a first following transistor and a second following transistor; the first following transistor comprises a first controlling node, a first following node and a first voltage source node; the second following transistor comprises a second controlling node, a second following node and a second voltage source node; a first voltage reduced circuit is electrically connected between a circuit power node and a second power supplying node; the first voltage reduced circuit is bias arranged so that the voltage between the power node and the second voltage source node is more than the voltage between the circuit power node and the first voltage source node, and the voltage between the circuit power node and the second voltage source node is more than the voltage between the power node and the first controlling node, thereby obtaining a high PSRR value.
Description
technical field [0001] The present invention relates to a semiconductor circuit, in particular to a reference signal generator and its method and system. Background technique [0002] In the application of analog-to-digital converters (ADC), the reference signal generator is an important component. The reference signal generator is used to generate and maintain a desired constant reference voltage for accurate analog-to-digital conversion as an ADC. In the analog-to-digital converter, a reference voltage (or reference voltage) that matches the conversion circuit is provided by using switched capacitor load technology. [0003] Since the generation of the reference voltage directly involves the calculation of analog-to-digital conversion, errors in the generation of the reference voltage will lead to a reduction in the performance of the ADC, such as the Signal-to-Noise Ratio (SNR) or the Equivalent Number of Bits (Equivalent Number of Bits, ENOB). The main sources of perf...
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IPC IPC(8): G05F1/56
Inventor 李民盛雷工刘松熊俊刘银才杨菲琴秦祖旭陈昌彦程黄俊朱华
Owner HUAWEI TECH CO LTD