Voltage-controlled oscillator (VCO) is: O a. an amplifier that is used to increase the loop gain and thus decrease the steady-state phase error. O b. a frequency modulator in which the frequency...

Extracted text: Voltage-controlled oscillator (VCO) is: O a. an amplifier that is used to increase the loop gain and thus decrease the steady-state phase error. O b. a frequency modulator in which the frequency deviation of the output is proportional to the VCO input signal. O C. a mixer followed by a LPF that is used to determine the phase error. O d. None of the answers A pre-emphasis filter is used to amplify the amplitudes of the high-frequency components in the modulating signal. Select one: O True O False TOSHIBA