Patent ID: 9515667
Filing Date: 2016-12-06
CPC Classification: H03B,H03K,H03L

Claim Text:
1. Circuitry for providing an oscillating output signal, comprising: a transconductance circuit having a first input, a second input, and an output; an oscillator circuit coupled to receive voltage from the output of the transconductance circuit, wherein the oscillating output signal is responsive to an output of the oscillator circuit; circuitry for providing a first voltage to the first input of the transconductance circuit; a frequency controlled circuit for providing a second voltage to the second input the transconductance circuit; wherein the second voltage is responsive to a frequency of operation of the frequency controlled circuit; and wherein the frequency of operation of the frequency controlled circuit is responsive to feedback derived from the output of the oscillator circuit; wherein the frequency controlled circuit comprises: a first switch and a second switch operable to open and close in non-overlapping phases responsive to the output of the oscillator circuit; and a capacitor connected from a node, between the first switch and the second switch, and a reference voltage; and wherein the non-overlapping operation of the first switch and the second switch creates a current by respectively charging and discharging the capacitor; wherein the frequency controlled circuit further comprises: a variable resistance, wherein the second voltage is responsive to the current passing through the resistance; and phase detection circuitry for adjusting the variable resistance in response to a phase comparison of a phase of an input data stream and a phase responsive to an output of the oscillator circuit.