Digitally-controlled oscillators having current mirrors and negative-feedback circuits therein that support high power supply rejection ratio (PSRR) and low noise characteristics
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 20, 2020
Grant Date -
N/A
app pub date -
Feb 8, 2019
filing date -
Jul 13, 2018
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A digitally-controlled oscillator (DCO) includes a current mirror configured to generate a reference current at a first output terminal thereof, and a supply current having a magnitude proportional to a magnitude of the reference current at a second output terminal thereof. An oscillation circuit is provided, which is responsive to the supply current at an input node thereof. This oscillation circuit generates a periodic output signal having a frequency that varies in response to changes in the magnitude of the supply current. A variable resistance circuit is provided, which is responsive to a first control signal having a magnitude that influences a value of a resistance provided between a first node thereof, which receives the reference current, and a second node thereof. A negative feedback circuit is provided, which has first and second current carrying terminals electrically coupled to the first output terminal of the current mirror and the first node of the variable resistance circuit, respectively, and a control terminal electrically coupled to the input node of the oscillation circuit.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully