A CIRCUIT FOR DATA COMPRESSION

摘要

PURPOSE: A signal compression circuit is provided to increase operation range of input voltage in which stable output signal is able to be generated by controlling gain of variable gain end in two levels. CONSTITUTION: A first comparator(41) compares input signal with a first reference voltage(VALC1) already assigned and outputs signal in proportion to the difference. A second comparator(42) compares input signal with a second reference voltage(VALC2) already assigned in a higher level than the level of the first reference voltage(VALC1) and outputs signal in proportion to the difference. A current mirror(43) generates control current in proportion to magnitude of signal output from the first comparator(41) and the second comparator(42). An automatic level control circuit(40) consists of two comparators(41-42) and one current mirror(43).