Quadrature voltage controlled oscillator
A voltage-controlled oscillation and oscillator technology, applied to power oscillators, electrical components, etc., can solve the problems of degraded quadrature voltage-controlled oscillator phase noise, low oscillation efficiency, etc.
Active Publication Date: 2017-02-01
CITY UNIVERSITY OF HONG KONG
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
For example, coupling transistors in P-QVCO and S-QVCO may introduce additional noise and as a result degrade the phase noise of the quadrature voltage controlled oscillator
Also, the oscillation efficiency in conventional P-QVCO and S-QVCO is generally low
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0041] refer to figure 1 , a quadrature voltage controlled oscillator 10 is provided, comprising: a first voltage controlled oscillator 100 having a first current source 102 electrically connected to each other, a first oscillator circuit 104, a first tuning circuit 106 and a first resonator circuit a second voltage controlled oscillator 200 having a second current source 202, a second oscillator circuit 204, a second tuning circuit 206 and a second resonator circuit 208 electrically connected to each other; the first oscillator circuit 104 includes a first transistor 110, a second transistor 112 and a first bias circuit connected between the first and second transistors 110, 112 for biasing the first and second transistors 110, 112 to operate in a class C mode; the second The oscillator circuit 204 includes a third transistor 210, a fourth transistor 212 and a second bias circuit connected between the third and fourth transistors 210, 212 for biasing the third and fourth tran...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A quadrature voltage controlled oscillator includes a first voltage controlled oscillator having a first current source, a first oscillator circuit, a first tuning circuit, and a first resonator tank; a second voltage controlled oscillator having a second current source, a second oscillator circuit, a second tuning circuit, and a second resonator tank. A first biasing circuit is connected between first and second transistors of the first oscillator circuit to bias them in a Class-C mode; and a second biasing circuit is connected between third and fourth transistors of the second oscillator circuit to bias them in the Class-C mode. The first and second voltage controlled oscillators are electrically coupled by bulk terminals of the first and second transistors coupled with drain terminals of the third and fourth transistors respectively, and bulk terminals of the third and fourth transistors coupled with drain terminals of the first and second transistors respectively.
Description
technical field [0001] The present invention relates to quadrature voltage controlled oscillators and in particular but not exclusively to CMOS wideband low phase noise Class C quadrature voltage controlled oscillators. Background technique [0002] Quadrature voltage controlled oscillators play an important role in modern wireless communication systems and are especially useful in applications requiring high-fidelity true quadrature signals, such as in wireless and wireline transceivers. One of the most popular types of quadrature voltage controlled oscillators is the LC quadrature voltage controlled oscillator, and it consists of two symmetrical LC tank voltage controlled oscillators coupled to each other. Typically, LC quadrature voltage controlled oscillators can be classified into parallel coupled quadrature voltage controlled oscillators (P-QVCO) and series coupled quadrature voltage controlled oscillators (S-QVCO). For the P-QVCO, the coupling transistors are placed ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/12
CPCH03B5/1228H03B5/124H03B5/1215H03B5/1243H03B5/1265H03B27/00H03B2200/0078
Inventor 薛泉张海伟岑鉴文
Owner CITY UNIVERSITY OF HONG KONG