Digital signal processing for linearization of small input...

Details Digital signal processing for linearization of small input... Digital signal processing for linearization of small input...

H - Electricity

03

F

H03F 3/38 (2006.01) H03F 1/32 (2006.01) H03F 3/217 (2006.01)

Patent

CA 2237633

An all digital switching amplifier includes an input over-sampling filter (20) for receiving a pulse code modulated (PCM) digital input signal. Oversampled PCM data are supplied to a multibit noise shaper (22), which frequency shapes 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).

Un amplificateur de commutation entièrement numérique comprend un filtre d'entrée suréchantillonneur (20) permettant de recevoir un signal d'entrée numérique à modulation par codage d'impulsions (PCM). Les données PCM suréchantillonnées sont transmises à un conformateur de bruit multibit (22), qui conforme en fréquence l'erreur de quantification. Les données PCM suréchantillonnées et à conformation de bruit sont transmises à un convertisseur amplitude-temps (24), qui produit des impulsions de commande de largeur variable. Celles-ci sont transmises par le convertisseur (24) à un circuit logique de commande de commutation (28), ce qui permet aux commutateurs (26) de relier un filtre (30) et une charge (32) à une alimentation (34).

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