Delta-sigma modulator with switched capacitor implementation

Details Delta-sigma modulator with switched capacitor implementation Delta-sigma modulator with switched capacitor implementation

H - Electricity

03

M

354/69

H03M 1/50 (2006.01) H03M 1/12 (2006.01) H03M 3/02 (2006.01) H04B 14/06 (2006.01)

Patent

CA 1191958

ABSTRACT OF THE DISCLOSURE A Delta-Sigma .DELTA..SIGMA. modulator for one-bit analog to digital conversion or a signal, such as a telephone voice channel signal to digital form is disclosed. The circuit incorporates integration operative as low-pass filtering. The voice signal is sampled at a rate high compared to the highest voice channel frequency component. Sampled in- stantaneous signal values are integrated, re-sampled and again integrated to reduce encoding noise. Finally, a bi-level sense identifying circuit links the second integrator output to a D type flip-flop providing the one-bit encoded output. The sampling and integrator control is elected by switching in a capacitor charge shifting arrangement under clock control and feedback is applied as a capacitor switch- ing program modification.

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