Wide-input voltage high-power supply rejection ratio reference voltage source
A technology of power supply rejection ratio and reference voltage source, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of unstable running track and easy deviation from the design track, and achieve area saving, power supply rejection ratio improvement, Effect of Reducing Static Power Consumption
Inactive Publication Date: 2013-01-16
CHENGDU PROMISING CHIP ELECTRONICS
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[0013] The purpose of the present invention is to overcome the problem that the running track of the current hoist is unstable and easily deviate from the original design track during the running process of the hoist, and to provide a positioning device for the running track of the hoist
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[0047] Such as figure 2 As shown, a wide input voltage high power supply rejection ratio PSRR reference voltage source of the present invention includes a self-bias circuit 1, a first-stage pre-adjustment circuit 2, a second-stage pre-adjustment circuit 3, a signal feedback circuit 5, and a sequentially connected self-bias circuit. Bandgap Reference Core Circuit4. Self-bias circuit 1 includes MOS transistor MP1, resistor R1, triode Q1, and triode Q2. The source of MOS transistor MP1 is connected to the external power supply VIN, and the drain and gate of MP1 are connected to the collector and transistor Q1 through resistor R1. The base is connected, the emitter of Q1 is connected to the collector and base of the transistor Q2 at the same time, the emitter of Q2 is grounded, the gate of MP1 is connected to the gate of MP2 in the first stage pre-adjustment circuit 2, and the collector of the transistor Q1 After connecting with the resistor R1, it is connected to the gate of MP...
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The invention discloses a wide-input voltage high-power supply rejection ratio reference voltage source. The reference voltage source comprises a self-bias circuit (1), a primary presetting circuit (2), a secondary presetting circuit (3), a bandgap reference core circuit (4) and a signal feedback circuit (5) which are sequentially connected. By using the self-bias circuit in a self-bias current mirror structure, the circuit can be started independently without using additional start circuits; by directly using the output of the secondary presetting circuit as the output of the reference voltage and simultaneously supplying power to the bandgap reference core circuit, the connection mode can improve the loading capacity of the reference voltage; by using the operational amplifier-free feedback loop for regulation, one clamping operational amplifier is removed from the traditional reference voltage source circuit, thereby saving the area and reducing the quiescent power dissipation; andcompared with the traditional bandgap reference voltage source circuit, the power supply rejection ratio of the output reference voltage, especially the performance under a high-frequency condition, is greatly improved.
Description
technical field [0001] The invention relates to a reference voltage source, in particular to a reference voltage source with wide input voltage and high power supply rejection ratio. Background technique [0002] Whether in digital circuits, analog circuits or digital-analog hybrid circuits, high-performance reference voltage sources are indispensable, and it plays a decisive role in the performance of the entire system. Usually, the reference voltage determines important system indicators such as the flipping level of the comparator, the oscillation frequency of the oscillator, and the current value flowing in the power tube. It is based on the above situation that the requirements for the reference voltage source circuit continue to increase, and many circuit structures have emerged. Such as figure 1 Shown, is a traditional reference voltage source design method. This circuit includes an operational amplifier with positive and negative input and output ports, resistors ...
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IPC IPC(8): G05F1/56
Inventor 林秀龙刘中伟
Owner CHENGDU PROMISING CHIP ELECTRONICS