Voltage regulator circuit and resistance deviation compensation method
A voltage regulator and circuit technology, applied in the field of voltage regulator circuit and resistance deviation compensation, can solve the problems of large influence of resistance element process, decrease of phase margin and gain margin, influence of circuit system performance, etc., so as to reduce the influence, Guaranteed performance
Active Publication Date: 2011-11-02
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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Problems solved by technology
[0002] Under the deep sub-micron process, there are large mismatches and deviations in the manufacturing process of integrated circuits, among which the resistance element is greatly affected by the process; usually the process deviation is considered to be ±20% in circuit design, when the system pole and When the resistance is related, the poles of the entire system will be affected by various influences. The offset will reach as much as ±20%, which may reduce the phase margin and gain margin that have just met the system stability requirements, thus seriously affecting the circuit system. performance, and will also affect the yield of mass-produced products
This has become a problem that all circuit designers have to consider
Method used
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[0015] The present invention provides a voltage regulator circuit such as figure 1 As shown, it includes an operational amplifier OP, the positive input terminal of the operational amplifier receives the input signal, the output terminal of the operational amplifier is connected to the gate of an NMOS transistor M1, and the drain of the NMOS transistor M1 is connected to the power supply terminal , the substrate end is grounded, the source is grounded through two series connected resistors R1 and R2, a feedback line is drawn between the two resistors R1 and R2, and connected to the inverting input terminal of the operational amplifier, the operational amplifier A bias circuit BAIS is also connected, the bias circuit provides a bias signal for the operational amplifier, the working state of the bias circuit is in the sub-threshold region to meet the compensation requirements, and the source of the NMOS transistor M1 serves as output of the voltage regulator circuit.
[0016] T...
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The invention discloses a voltage adjuster circuit, which includes an operational amplifier. A positive direction inputting terminal of the operational amplifier receives input signal, an outputting terminal of the operational amplifier connects with a source follower composed of NMOS pipe, the operational amplifier also connect with a biasing circuit, the biasing circuit provides biasing signal to the operational amplifier. The invention also discloses a resistor tolerance compensation method, the circuit pole point is proportional to corresponding resistor, the resistor uses same technique variable direction resistor or same resistor, when resistor changes, the pole point moves towards to same direction on coordinate for compensating increase biasing and phase biasing caused by resistorvariable. The circuit provided by the invention can reduce effect to the circuit increase and phase caused by factors such as technique biasing or temperature biasing efficiently, ensures the circuitproperty.
Description
technical field [0001] The invention relates to a circuit, especially a voltage regulator circuit. The invention also relates to a resistance deviation compensation method. Background technique [0002] Under the deep sub-micron process, there are large mismatches and deviations in the manufacturing process of integrated circuits, among which the resistance element is greatly affected by the process; usually the process deviation is considered to be ±20% in circuit design, when the system pole and When the resistance is related, the poles of the entire system will be affected by various influences. The offset will reach as much as ±20%, which may reduce the phase margin and gain margin that have just met the system stability requirements, thus seriously affecting the circuit system. Performance will also affect the yield of mass-produced products. This becomes a problem that all circuit designers have to consider. [0003] In order to solve this problem, the current main ...
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IPC IPC(8): G05F1/56
Inventor 孟醒
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP