Abstract: An high speed analog-to-digital converter, for converting an analog input signal (u(t)) with a maximum frequency (Fmax) to a digital output signal (x(n)) with an output sampling rate (Fs) at least double the maximum frequency (Fmax), comprises a plurality of analog narrowband filters (Fo-FM−1) for filtering the analog input signal (u(t)) to produce a corresponding plurality of narrowband signals (X0-XM−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 (AD0-ADM−1) comprises a sample-and-hold device (SH) and a quantizer (Q).

Abstract: A high speed analog-to-digital converter, for converting an analog input signal (u(t)) with a maximum frequency (Fmax) to a digital output signal (x(n)) with an output sampling rate (Fs) at least double the maximum frequency (Fmax), comprises a plurality of analog narrowband filters (F0-FM−1) for filtering the analog input signal (u(t)) to produce a corresponding plurality of narrowband signals (X0-XM−1), which is supplied to a corresponding plurality of analog-to-digital converter units (AD0-ADM−1). 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)).