H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/104, 330/87
H03F 1/34 (2006.01) G01V 1/22 (2006.01) G01V 1/24 (2006.01) G01V 1/38 (2006.01) H03G 3/20 (2006.01) H04J 3/04 (2006.01) H04J 3/10 (2006.01)
Patent
CA 1092203
GAIN-RANGING AMPLIFIER SYSTEM ABSTRACT OF THE DISCLOSURE The compression portion of an instantaneous companding (compres- sing-expanding) system includes at least two and preferably four "bi-gain" amplifiers connected in cascade. Each bi-gain amplifier normally has a low-gain state and can be switched to a discrete high-gain state. A discrete reference voltage is provided to compare with the output of each amplifier. The amplifiers are initally switched to their low-gain states and the reference voltage corresponding to the first amplifier is selected. A comparator means makes a comparison between the system's output voltage and the selected reference voltage. The control means switches the first amplifier to its high-gain state or holds it in the low-gain state depending on the result of the comparison. By utilizing a different variable reference voltage and bi-gain amplifiers with two different amplification factors, the number of amplifiers and comparisons is significantly reduced. Noise-cancelling means are also associated with each amplifier to remove undersired DC noise signals from each amplifier.
252003
Macrae & Co.
Western Geophysical Company Of America
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