Power generating circuit, frequency generating circuit and frequency control system
AssigneeEgalax_Empia Technology Inc.
InventorPo-Chuan Lin
Life of this patent
Estimating the term…
Abstract
A frequency control system includes a power generating circuit and a frequency generating circuit. The power generating circuit includes an up transistor circuit, a down transistor circuit and a capacitor for generating a stable voltage. The frequency generating circuit includes a digital-to-analog converter (DAC), a current source/sink circuit, a voltage-controlled oscillator (VCO) and a digital controller. The DAC receives the stable voltage as a power, the current source/sink circuit receives an analog signal from the DAC, the VCO receives a control voltage from the current source/sink circuit, and the digital controller receives a frequency signal from the VCO and a reference signal, according to which a digital signal is generated and fed to the DAC.
Claims26
A frequency control system, comprising:
- a power generating circuit including an up transistor circuit, a down transistor circuit and a capacitor, the up transistor circuit and the down transistor circuit being connected in series and having a node situated therebetween, the capacitor being electrically coupled between the node and ground, a stable voltage being generated at the node;
- and
- a frequency generating circuit including:
- a digital-to-analog converter (DAC) receiving the stable voltage as a power, the DAC outputting an analog signal;
- a current source/sink circuit receiving the analog signal and outputting a control voltage;
- a voltage-controlled oscillator (VCO) receiving the control voltage and according generating a frequency signal;
- and
- a digital controller receiving the frequency signal and a reference signal, according to which a digital signal is generated and fed to an input end of the DAC.
A power generating circuit, comprising:
- an up transistor circuit;
- a down transistor circuit, the up transistor circuit and the down transistor circuit being connected in series and having a node situated therebetween;
- and
- a capacitor being electrically coupled between the node and ground, a stable voltage being generated at the node.
A frequency generating circuit, comprising:
- a digital-to-analog converter (DAC) receiving a stable voltage as a power, the DAC outputting an analog signal;
- a current source/sink circuit receiving the analog signal and outputting a control voltage;
- a voltage-controlled oscillator (VCO) receiving the control voltage and according generating a frequency signal;
- and
- a digital controller receiving the frequency signal and a reference signal, according to which a digital signal is generated and fed to an input end of the DAC.
Dependencies are inferred from the claim text.