Current biasing circuit
A current bias, circuit technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as the inability of the circuit to output current
Active Publication Date: 2014-12-10
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
V DS1 with V DS2 There is a large difference between them, and the traditional circuit cannot output a current that has nothing to do with the input power
Method used
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Embodiment Construction
[0045] Such as figure 2 As shown, an embodiment of the current bias circuit of the present invention includes:
[0046] The 9 PMOS tubes are numbered PM1 to PM9, the 7 NMOS tubes are numbered NM1 to NM7 and a resistor R;
[0047] The source of PM1 is connected to the sources of PM2 and PM7, the gate is connected to the drain of NM3 and the gate of PM7, and the drain is connected to the source of PM3;
[0048] The gate of PM2 is connected to the drain of PM3, and the drain is connected to the source of PM4;
[0049] The gate of PM3 is connected to the gates of PM4, PM8, PM9 and the drains of PM8, NM5, and its drain is connected to the drain of NM3 through a resistor R;
[0050] The source, drain and body of PM5 are connected to the source of PM6 after being short-circuited, and the gate is connected to the gate of NM1;
[0051] The source, drain and body of PM6 are short-circuited, and its gate is connected to the gate of NM3;
[0052] The drain of PM7 is connected to the source of PM9, ...
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The invention discloses a current biasing circuit which comprises 9 P-channel metal oxide semiconductors (PM1-PM9), 7 N-channel metal oxide semiconductors (NM1-NM7) and a resistor R. A source of the PM1 is connected with sources of the PM2 and the PM7, a grid of the PM1 is connected with a drain of the NM3 and a grid of the PM7, and a drain of the PM1 is connected with a source of the PM3. A grid of the PM2 is connected with a drain of the PM3, and a drain of the PM2 is connected with a source of the PM4. A grid of the PM3 is connected with grids of the PM4, the PM8 and the PM9 and drains of the PM8 and the NM5, and a drain of the PM3 is connected with a drain of the NM3 through the resistor R. A source and a drain of the PM5 are in short circuit to be connected with a source of the PM6, and a grid of the PM5 is connected with a grid of the NM1. A source and a drain of the PM6 are in short circuit, and a grid of the PM6 is connected with the grid of the NM3. A drain of the PM7 is connected with a source of the PM9, and a source of the PM9 is connected with a drain of the NM6. Sources of the NM1, the NM2, the NM3, the NM4, the NM5, the NM6, the NM7, the NM8 and the NM9 and the corresponding grids are in short circuit. A source of the NM1 is connected with the ground, a grid of the NM1 is connected with the grids of the NM2, the NM3, th3 NM4, the NM5, the NM6 and the NM7 and a drain of the PM4, and a drain of the NM1 is connected with a source of the NM3. The current biasing circuit can generate current irrelevant with an input power supply.
Description
Technical field [0001] The invention relates to the field of integrated circuits, in particular to a bias current circuit. Background technique [0002] To amplify the signal voltage without distortion, the amplifier composed of transistors must ensure that the emitter junction of the transistor is forward biased and the collector junction is reverse biased. That is, its operating point should be set. The so-called operating point is to make the base, emitter and collector of the transistor at the required potential through the setting of the external circuit (can be obtained by calculation). These external circuits are called bias circuits (it can be understood as a circuit that sets the PN junction forward and reverse bias), and the current provided by the bias circuit to the transistor is called the bias current. Commonly used common emitter amplifier circuit, the mainstream is the IC from the emitter to the collector, and the bias current is the IB from the emitter to the b...
Claims
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IPC IPC(8): G05F1/46
Inventor 李丹朱红卫胡冠斌
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP