Signal processing apparatus having A/D conversion function

Details Signal processing apparatus having A/D conversion function Signal processing apparatus having A/D conversion function

1993-10-13

1996-05-21

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 136

Patent

active

055193986

ABSTRACT:
A signal processing apparatus for converting an analog signal to a digital signal and processing the digital signal. In particular, a digital filter for performing processing at high speed is implemented by using an integrated circuit of low power consumption. The signal processing apparatus includes a circuit for comparing an input analog signal with each voltage of a plurality of analog reference voltages and generating a thermometer code Tc depending upon the analog input signal, a decoder for detecting a change point of the thermometer code Tc, and a plurality of memory circuits having output signal lines of the decoder as word selection lines. The product of an input signal value corresponding to each word selection line and a predetermined filter coefficient is stored in the corresponding word of the memory circuits. The memories are used as look-up tables.

REFERENCES:
patent: 4884075 (1989-11-01), Mangelsdorf
patent: 5223834 (1993-06-01), Wang et al.

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