Charge pump reference voltage regulation circuit
A reference voltage regulation and reference voltage technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of limiting the application range of the adjustable reference voltage Vrefo voltage, and achieve the effect of expanding the application range
Active Publication Date: 2017-10-24
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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- Application Information
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Problems solved by technology
[0006] It can be seen from the above that the existing charge pump reference voltage adjustment circuit can only realize unilateral adjustment, and this adjustment method limits the application range of the adjustable reference voltage Vrefo voltage
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Embodiment Construction
[0031] Such as image 3 As shown, it is a diagram of the reference voltage adjustment circuit 1 of the charge pump 6 according to the embodiment of the present invention. The reference voltage adjustment circuit 1 of the charge pump 6 according to the embodiment of the present invention includes:
[0032] The first operational amplifier 2, the inverting input terminal of the first operational amplifier 2 is connected to the input reference voltage, and the non-inverting input terminal of the first operational amplifier 2 is connected to the first feedback voltage fdbk1. Preferably, the first operational amplifier 2 is a transconductance operational amplifier (OTA).
[0033] The first PMOS transistor P0, the source of the first PMOS transistor P0 is connected to the power supply voltage vdd, and the gate of the first PMOS transistor P0 is connected to the output terminal of the first operational amplifier 2 .
[0034] A resistor string 3 formed by n-level resistor series 3 and...
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The invention discloses a charge pump reference voltage adjusting circuit, comprising: a first operational amplifier connected at positive phase and negative phase input ends respectively to input reference voltage and first feedback voltage; a gate of a first PMOS tube is connected with an output end of the first operational amplifier; a resistor string formed by serially connecting n levels of resistors and a switch array composed of n levels of switches are included; the resistor string is connected between a drain of the first PMOS tube and ground; the top ends of the various levels of resistors are connected respectively to adjustable reference voltage; the first feedback voltage is led out from the top ends of the resistors of intermediate level in the resistor string; the various levels of switches are made on or off under control of a control signal, only one level of switches is made on when the charge pump reference voltage adjusting circuit is under operation, and magnitude of the adjustable reference voltage is adjusted by adjusting the number of the respective levels of made-on switches. The charge pump reference voltage adjusting circuit can operate normally even when input reference voltage has a great deviation, and thus, applicable range of the circuit is wider.
Description
technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to a charge pump reference voltage regulating circuit. Background technique [0002] The charge pump (Pump) circuit needs a finely adjustable reference voltage, which is compared with the divided voltage of the output voltage of the charge pump to output a control signal to control the pump to output the expected voltage. The existing charge pump reference voltage regulation circuit can only realize unilateral regulation. [0003] Such as figure 1 Shown is the existing first charge pump reference voltage adjustment circuit diagram; the reference voltage adjustment circuit 101a includes a transconductance operational amplifier (OTA) 102, a PMOS transistor P100, a voltage divider circuit composed of an adjustable resistor Rs and a resistor R100, and the transconductance The inverting input terminal of the operational amplifier 102 is connected to the input reference voltage Vref...
Claims
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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 赵艳丽傅俊亮王鑫
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP