Analog-to-digital converter circuit having high dynamics

Details Analog-to-digital converter circuit having high dynamics Analog-to-digital converter circuit having high dynamics

1994-05-31

1996-08-13

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

341155, H03M 118

Patent

active

055460810

ABSTRACT:
For converting a high-frequency analog signal, which is modulated by a modulation signal, an analog-to-digital converter circuit included a first analog-to-digital converter which is preceded by an amplifier having controllable gain, and which is followed by a controllable divider. A quantization unit generates control signals from the analog input signal for setting the gain of the controllable gain amplifier and for setting the divisor of the controllable divider. The quantization unit includes a second analog-to-digital converter which digitizes the analog input signal a rate approximately corresponding to the sampling rate of the first analog-to-digital converter. The second analog-to-digital converter is followed by a rectification unit which rectifies the signal digitized by the second converter. The rectification unit is followed by a coder which generates an output which increases with increasing momentary amplitude of the rectified signal. The coder is followed by a peak value detector, which is reset at a rate which is above the Nyquist frequency of the modulation signal, and which delivers a control signal to the amplifier and to the divider until the coder generates a higher output signal, which then causes a new control signal to be substituted for the previous control signal.

REFERENCES:
patent: 4851842 (1989-07-01), Iwamatsu
patent: 5124707 (1992-06-01), Stove

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