Charge pumping circuit and PLL circuit

Details Charge pumping circuit and PLL circuit Charge pumping circuit and PLL circuit

1995-09-07

1997-04-29

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327403, 327536, H03K 300

Patent

active

056253060

ABSTRACT:
In a charge pumping circuit capable of setting a wide output voltage range, a current mirror circuit (4) is provided with a transistor (T5) having an emitter which is grounded through a resistance (R1) and a collector (base) which is connected to that of a transistor (T2), and a transistor (T6) having an emitter which is grounded through a resistance (R2), and a collector which is connected to an output terminal (3). The transistor (T2) has a base which receives an inverted down signal/DOWN, and an emitter which is connected to a constant current source (1). A current mirror circuit (5) is provided with a transistor (T7) having an emitter which is connected to a power source (VDD) through a resistance (R3) and a collector (base) which is connected to that of a transistor (T4), and a transistor (T8) having an emitter which is connected to the power source (VDD) through the resistance (R2) and a collector which is connected to the output terminal (3). The transistor (T4) further has a base which receives an up signal (UP), and an emitter which is connected to the constant current source (2).

REFERENCES:
patent: 4322643 (1982-03-01), Preslar
patent: 4897612 (1990-01-01), Carroll
patent: 5241227 (1993-08-01), Jung et al.
patent: 5357216 (1994-10-01), Nguyen
patent: 5453680 (1995-09-01), Giolma et al.
patent: 5473283 (1995-12-01), Luich

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