Digital-to-analogue converter

Details Digital-to-analogue converter Digital-to-analogue converter

2011-06-07

2011-06-07

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S144000, C341S154000

Reexamination Certificate

active

07956786

ABSTRACT:
An N-bit DAC comprises a main DAC circuit having main nodes on which analogue voltages are produced of progressively increasing values in steps of the value of one MSB value, and a sub-DAC circuit having secondary nodes on which analogue voltages are produced of progressively increasing values in steps of the value of one LSB. A main switch network couples the secondary nodes to a selected pair of main nodes as the MSB value of the digital input signal varies. A secondary switch network selectively couples one of secondary nodes to an output terminal for providing an analogue voltage output signal. The main nodes are coupled between main terminals, and a voltage reference is applied across input terminals. A first offset circuit and a first compensating circuit are selectively coupleable between the main DAC circuit and the input terminals for offsetting the main node analogue voltages downwardly.

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