Switched current source

Details Switched current source Switched current source

2001-12-28

2003-04-08

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

C341S150000

Reexamination Certificate

active

06545619

ABSTRACT:

BACKGROUND
Switched current sources may be used as the building blocks of complementary metallic oxide semiconductor (CMOS) circuits, such as digital-to-analog (D/A) converter circuits, that use digital input signals to control the switch portion of the current source. The switch portion may be implemented using a p-channel MOS (PMOS) transistor or an n-channel MOS (NMOS) transistor.
The switch portion may be placed in the analog portion of the circuit. The digital input signals that control the switch portion are often part of a digital portion. The digital portion and the analog portion may have separate power supplies. Occasionally, the digital power supply is exposed to a higher noise ratio than the analog portion. As a result, the noise in the digital portion may be transferred to the analog portion through the digital input signal.


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patent: 6281824 (2001-08-01), Masuda
Shu-Yuan Chin, Chung-Yu Wu, “A 10-b 125 MHz CMOS Digital-to-Analog Converter (DAC) with Threshold-Voltage Compensated Current Sources,” Nov. 1994,IEEE Journal of Solid-State Circuits, vol. 29, No. 11, pp. 1374-1380.
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