Transconductor circuit for a fourth order PLL

A phase locked loop (PLL) circuit and a method for providing a transconductance in the PLL involve forming an input voltage to an operational amplifier by a loop filter. A voltage output of the operational amplifier controls a plurality of current mirrors. A current is formed through a first one of...

Full description

Saved in:
Bibliographic Details
Main Authors Summers, Mark Alan, Huss, Scott David
Format Patent
LanguageEnglish
Published 11.12.2018
Subjects
AMPLIFIERS
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
Online AccessGet full text

Cover

More Information
Summary:A phase locked loop (PLL) circuit and a method for providing a transconductance in the PLL involve forming an input voltage to an operational amplifier by a loop filter. A voltage output of the operational amplifier controls a plurality of current mirrors. A current is formed through a first one of the current mirrors as a function of the input voltage, a resistance of a resistor, and a reference voltage. The reference voltage is directly provided by, or derived from, a reference signal. A second voltage formed in the first current mirror is fed back to the operational amplifier to maintain the current through the first current mirror, which current is then mirrored into at least a second one of the current mirrors to form an output current proportional to a difference between the input voltage and the reference voltage.
Bibliography:Application Number: US201715418327