High speed analog-to-digital converter and digital-to-analog...

Details High speed analog-to-digital converter and digital-to-analog... High speed analog-to-digital converter and digital-to-analog...

H - Electricity

03

M

H03M 1/36 (2006.01) H03M 1/12 (2006.01) H03M 1/18 (2006.01) H03M 1/66 (2006.01)

Patent

CA 2256779

An high speed analog-to-digital converter, for converting an analog input signal (u(t)) with a maximum frequency (F max) to a digital output signal (x(n)) with an output sampling rate (F~) at least double the maximum frequency (F max), comprises a plurality of analog narrowband filters (Fo, F M-1) for filtering the analog input signal (u(t)) to produce a corresponding plurality of narrowband signals (X0-X M-1). Each narrowband filter has a passband. The sum of the gains of the narrowband filters at any frequency within an operating frequency band of the plurality of narrowband filters is substantially unity. Each of a corresponding plurality of analog-to-digital converter units (AD 0- AD M-1) comprises a sample-and-hold device (SH) and a quantizer (Q). The sample-and- hold devices are clocked by a corresponding plurality of clock signals (.PHI. 0- .PHI. M-1), respectively, each of the plurality of clock signals having a frequency at least double the bandwidth of the corresponding narrowband filter and an integer division of said predetermined sampling rate. The converter also comprises sampling and summing circuitry for sampling the outputs of the analog-to-digital converter units sequentially at the predetermined sampling rate (Fs) and summing the resulting sampled signals to produce the digital output signal (x(n)). The frequencies of the plurality of clock signals, and their phase-displacements relative to the output sampling clock signal, are such that each sample of the analog-to-digital converter output signal corresponds to a sampling edge of a different one of the sample-and-hold clock signal.

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