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High power supply rejection ratio (PSRR) reference source circuit with adjustable output

A technology with high power supply rejection ratio and reference source circuit, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., and can solve the problem of low power supply rejection ratio

Inactive Publication Date: 2009-12-09
IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
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Problems solved by technology

[0015] The above-mentioned voltage-type reference source circuit can only output an output voltage with zero temperature coefficient of 1.2V, thereby limiting the scope of use of the reference source; the current-type reference source circuit can output different voltage values ​​with zero temperature coefficient through the adjustment of resistor R4 , but the power supply rejection ratio of these two reference source circuits is not high, about 50db; what is needed now is a reference source circuit with a high current rejection ratio

Method used

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  • High power supply rejection ratio (PSRR) reference source circuit with adjustable output
  • High power supply rejection ratio (PSRR) reference source circuit with adjustable output
  • High power supply rejection ratio (PSRR) reference source circuit with adjustable output

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Embodiment Construction

[0043] A high power supply rejection ratio reference source circuit with adjustable output, which can be a current type reference source circuit or a voltage type reference source circuit, including a generation circuit of the reference source circuit and a first stage circuit for increasing the power supply rejection ratio. It is characterized in that: a floating voltage source is set in the generation circuit of the reference source circuit, a gain improvement stage is set on the reference voltage output circuit,

[0044] Provide appropriate bias voltage to the gain-enhancing stage through the floating voltage source to ensure that all the gain-enhancing stages work in the saturation region, so that the bias can be adjusted through the floating voltage source to ensure that the reference source circuit is in the entire output range of VREF. Has a large power supply rejection ratio.

[0045] The floating voltage source can be realized by MOS transistors or resistors or other ...

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Abstract

The invention discloses a high PSRR reference source circuit with adjustable output, comprising a generating circuit of a reference source circuit and a first grade circuit for PSRR increase. The circuit is characterized in that a floating voltage source is arranged in the generating circuit of the reference source circuit, a gain increase grade is arranged on a reference voltage output circuit, and the floating voltage source provides proper bias voltage for the gain increase grade so that the gain increase grade can competely work in a saturation region and the reference source circuit can have high PSRR in the entire VREF output region; and the floating voltage source and the gain increase grade guarantee that the reference source circuit can always have high PSRR during the output of wide range of VREF (higher than 1.2V).

Description

technical field [0001] The invention belongs to the field of analog integrated circuits and mixed signal integrated circuits, in particular to a reference source circuit with adjustable output and high power supply rejection ratio. Background technique [0002] The reference source circuit is an important module in the design of analog integrated circuits and hybrid integrated circuits. There are two main parameters to measure the performance of the reference source circuit: one is the relationship between the output voltage and the temperature change, and the other is the output voltage and the power supply. Relationship. The output voltage of an ideal reference source circuit does not change with changes in temperature and power supply. Therefore, a reference source circuit with low temperature coefficient and high power supply rejection ratio becomes the two basic requirements for reference source design. [0003] There are two basic types of reference circuits: voltage-...

Claims

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Application Information

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IPC IPC(8): G05F3/30
Inventor 朱国军
Owner IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
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