DIGITAL SIGNAL PROCESSING FOR LINEARIZATION OF SMALL INPUT SIGNALS TO A TRI-STATE POWER SWITCH

摘要

An all digital switching amplifier includes an input over-sampling filter (2 0) for receiving a pulse code modulated (PCM) digital input signal. Oversampled PCM data are supplied to a multibit noise shaper (22), which frequency shape s quantization error. The oversampled, noise-shaped, PCM data is applied to an amplitude-to-time converter (24), which produces variable-width command pulses. The command pulses from converter (24) are applied to switch drive logic circuit (28) to enable switches (26) to connect a filter (30) and load (32) to power supply (34).