Patent ID: 7978169

Claim:
A signal processing circuit comprising: a first step-up level shifter which transforms an incoming low-amplitude clock signal from a control circuit to a high-amplitude clock signal having a higher amplitude than the incoming low-amplitude clock signal; a first logic operation circuit operating at a first voltage which performs a logic operation using the high-amplitude logic output signal of the first step-up level shifter; a low-voltage signal generator which is a step-down level shifter transforming an incoming high-amplitude logic signal from the first logic operation circuit to a low-amplitude logic signal having a lower amplitude than the high-amplitude logic signal; a second step-up level shifter which transforms the incoming low-amplitude signal from the low-voltage signal generator to a high-amplitude signal having a higher amplitude than the incoming low-amplitude signal, and a second logic operation circuit operating at the first voltage which performs a logic operation using the high-amplitude signal of the second step-up level shifter.