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Bias voltage supplier, start circuit and starting method for biasing circuit

A technology of bias circuit and start-up circuit, which is applied in the direction of instruments, adjusting electrical variables, control/regulating systems, etc., can solve the problem that the bias circuit 20 cannot work normally, and achieve the effect of reducing power consumption

Inactive Publication Date: 2009-01-14
BEYOND INNOVATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the start-up circuit 31 not only has the problem of a large amount of leakage current, but also the bias circuit 20 is interfered by the start-up circuit 31 and cannot work normally.
In other words, the startup circuit 31 disclosed in the prior art can only be used when the voltage Vdd is not high

Method used

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  • Bias voltage supplier, start circuit and starting method for biasing circuit
  • Bias voltage supplier, start circuit and starting method for biasing circuit
  • Bias voltage supplier, start circuit and starting method for biasing circuit

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Embodiment Construction

[0045] Fig. 3A is a circuit diagram of a bias voltage supply according to the first embodiment of the present invention. Referring to FIG. 3A, the bias voltage supply 12 includes a bias voltage circuit 20 and a startup circuit 32. The bias circuit 20 includes current mirrors 40 and 41. The current mirror 40 includes, for example, N-type MOSFETs 110 and 111 and a resistor 130. The drain and gate of the transistor 110 are coupled to each other, and the size ratios of the transistors 110 and 111 are different. The resistor 130 is used to provide a voltage difference, so that the current mirror 40 can generate current. The current mirror 41 includes, for example, P-type MOSFETs 120 and 121, wherein the drain and gate of the transistor 121 are coupled to each other.

[0046] Generally speaking, the bias circuit 20 has two stable point states, namely a zero stable state and a saturated stable state. When the voltage Vdd is provided to the bias circuit 20 at the initial stage, the bias c...

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Abstract

The invention provides a method for starting bias providers, start-up circuits and bias circuits. The bias provider comprises a bias circuit, a first switch, a second switch and a power storage unit. The first switch is coupled between a first voltage and a contact, and the connection or disconnection of the first switch is determined according to the feedback voltage output by the bias circuit. The power storage unit is coupled between the contact and a second voltage. The second switch determines whether to output start-up voltage to the bias circuit according to voltage of the contact. That is to say, the invention, by utilizing the charging and discharging property of the power storage unit and the feedback voltage output by the bias circuit, controls the second switch to or not to output the start-up voltage to the bias circuit, thereby reducing the power consumption of the start-up circuit.

Description

Technical field [0001] The present invention relates to a bias voltage supply device, in particular to a starting technology of the bias voltage supply device. Background technique [0002] In analog circuits, current mirrors are often used as bias circuits. This kind of bias circuit requires a start-up circuit to make the bias circuit work normally. [0003] FIG. 1 shows a circuit diagram of a conventional bias supply (Bias Supply). Please refer to FIG. 1, the bias voltage supply 10 can be divided into two parts, namely the bias circuit 20 and the start-up circuit 30. The bias circuit 20 includes current mirrors 40 and 41 and a resistor 130. The current mirror 40 is composed of N-type MOSFETs 110 and 111, the drain and gate of the transistor 110 are coupled to each other, and the size ratio (or the channel aspect ratio) of the transistors 110 and 111 is different. The resistor 130 is used to provide a voltage difference so that the current mirror 40 can generate current. The cur...

Claims

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Application Information

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IPC IPC(8): G05F3/26
Inventor 陈力辅李智顺
Owner BEYOND INNOVATION TECH