Phase locked loop circuit
First Claim
Patent Images
1. A phase locked loop circuit comprising:
- a loop filter having a first input terminal and a second input terminal and comprising;
a first capacitor coupled to the first terminal;
a resistor having one terminal coupled to the first input terminal;
a second capacitor coupled to the second input terminal; and
a source follower having an input terminal coupled to the second input terminal and an output terminal coupled the other terminal of the resistor;
a first charge pump coupled to the first input terminal outputting a first current; and
a second charge pump coupled to the second input terminal outputting a second current;
wherein the first current is a multiple of the second current.
1 Assignment
0 Petitions
Accused Products
Abstract
A phase locked loop circuit includes a loop filter having a first input terminal and a second input terminal and including a first capacitor coupled to the first terminal; a resistor having one terminal coupled to the first input terminal; a second capacitor coupled to the second input terminal; and a source follower having an input terminal coupled to the second input terminal and an output terminal coupled the other terminal of the resistor; a first charge pump coupled to the first input terminal outputting a first current; and a second charge pump coupled to the second input terminal outputting a second current; wherein the first current is a multiple of the second current.
-
Citations
6 Claims
-
1. A phase locked loop circuit comprising:
-
a loop filter having a first input terminal and a second input terminal and comprising;
a first capacitor coupled to the first terminal;
a resistor having one terminal coupled to the first input terminal;
a second capacitor coupled to the second input terminal; and
a source follower having an input terminal coupled to the second input terminal and an output terminal coupled the other terminal of the resistor;
a first charge pump coupled to the first input terminal outputting a first current; and
a second charge pump coupled to the second input terminal outputting a second current;
wherein the first current is a multiple of the second current. - View Dependent Claims (2, 3, 4, 6)
-
-
5. The phase locked loop circuit as claimed in claim 5, further comprising a phase detector having two input terminals respectively coupled to the output terminal of the first frequency divider and a second frequency divider, and two output terminals respectively connected to the first charge pump and the second charge pump.
Specification