| 摘要 |
PURPOSE:To eliminate the effect of noise caused in an inverse amplifier circuit by outputting an oscillation signal from an output terminal of the inverse amplifier circuit to a semiconductor integrated circuit of the next stage via a switch circuit. CONSTITUTION:Oscillation signals whose phases are opposite to each other are outputted from two output terminals 11 of the inverse amplifier circuit 1 normally, P-channel MOS transistors (TRs) Q1, Q2 or N-channel MOS TRs Q3, Q4 are made into energized states and a shaped clock signal is outputted from an inverter 2. On the other hand, if noise is caused in the circuit 1 and the signals from both the terminals 11 are in phase and one of the TRs Q1, Q2 and one of the TRs Q3, Q4 are made into non-energized states, the level between the TRs Q2 and Q3 is kept to a level when the TRs Q1, Q2 or Q3, Q4 are made into energized states previously. Thus, a clock signal not susceptible to the effect of noise caused in the circuit 1 is outputted from the inverter 2. |
