Patent ID: 6570517
Filing Date: 2003-05-27
Classification: H03M

Abstract:
A multi-channel digital to analog circuit for converting digital codes to analog signals, the circuit comprising:a primary digital to analog converter (DAC) for receiving digital input codes and outputting corresponding analog signals, a plurality of infinite sample-and-hold circuits for sampling the analog signals outputted by the primary DAC and for holding analog signals similar to the corresponding analog signals sampled from the primary DAC, the infinite sample-and-hold circuits defining respective analog outputs of the multi-channel circuit on which the respective analog signals similar to the corresponding sampled analog signals are held, each infinite sample-and-hold circuit comprising a secondary DAC having an analog output from which the analog signal held on the analog output of the corresponding infinite sample-and-hold circuit is derived, and an analog to digital converting circuit for converting each analog signal sampled from the primary DAC by the corresponding infinite sample-and-hold circuit to a digital code for applying to the corresponding secondary DAC so that the analog signal outputted by the secondary DAC is similar to the corresponding sampled analog signal, and a primary switching mechanism for selectively sampling analog signals outputted by the primary DAC onto the infinite sample-and-hold circuits.