Patent ID: 8669810
Filing Date: 2014-03-11
Classification: G04F,H03K

Abstract:
1. A time difference amplifier using slew rate control, comprising: a first digital signal output unit including a first slew rate setting section configured to set a first slew rate for a voltage charged to a level of a power supply voltage in a first charging capacitor and generate a first output voltage which is decreased with the first slew rate when a first digital input signal inputted to a first input terminal transitions and to change the first slew rate to a second slew rate and generate the first output voltage which is decreased with the second slew rate when a second digital input signal inputted to a second input terminal transitions so that phases of the first digital input signal and the second digital input signal become different from initial phases, and a first voltage comparator configured to compare the first output voltage outputted from the first slew rate setting section with a reference voltage and accordingly output a first digital signal; and a second digital signal output unit including a second slew rate setting section configured to output a voltage of the level of the power supply voltage charged in a second charging capacitor as a second output voltage when the second digital input signal inputted to a third input terminal does not transition and to set the second slew rate for the voltage charged to the level of the power supply voltage and generate the second output voltage which is decreased with the second slew rate when the second digital input signal inputted to the third input terminal transitions so that the phases of the first digital input signal and the second digital input signal become different from the initial phases, and a second voltage comparator configured to compare the second output voltage outputted from the second slew rate setting section with the reference voltage and accordingly output a second digital signal.