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Class Information
Number: 327/238
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Signal converting, shaping, or generating > Phase shift by less than period of input > Variable or adjustable > Quadrature related (i.e., 90 degrees)
Description: Subject matter wherein the variable or adjustable phase shift control involves the state or condition of two related periodic functions or two related points separated by a quarter of a cycle or 90 electrical degrees.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7598787 |
Signal generation apparatus, frequency converting apparatus, and receiver |
Oct. 6, 2009 |
| 7600167 |
Flip-flop, shift register, and scan test circuit |
Oct. 6, 2009 |
| 7576584 |
Clock generators for generation of in-phase and quadrature clock signals |
Aug. 18, 2009 |
| 7558357 |
Systems and methods for reducing frequency-offset induced jitter |
Jul. 7, 2009 |
| 7555051 |
Method and device for estimating IQ imbalance |
Jun. 30, 2009 |
| 7538594 |
Method for reducing delay difference of differential transmission and system thereof |
May. 26, 2009 |
| 7463108 |
Active 90-degree phase shifter with LC-type emitter degeneration and quadrature modulator IC using the same |
Dec. 9, 2008 |
| 7342987 |
90-degree phase shifter |
Mar. 11, 2008 |
| 7298222 |
Systems and method for automatic quadrature phase imbalance compensation using a delay locked loop |
Nov. 20, 2007 |
| 7123103 |
Systems and method for automatic quadrature phase imbalance compensation using a delay locked loop |
Oct. 17, 2006 |
| 7081783 |
Method and apparatus for generating and controlling a multiphase clock |
Jul. 25, 2006 |
| 7075351 |
Method and apparatus for generating a multiphase clock |
Jul. 11, 2006 |
| 7071750 |
Method for multiple-phase splitting by phase interpolation and circuit the same |
Jul. 4, 2006 |
| 6995593 |
Circuit for programmable stepless clock shifting |
Feb. 7, 2006 |
| 6995595 |
Direct conversion receiver having a DC offset eliminating function |
Feb. 7, 2006 |
| 6982584 |
Phase quadrature and slaved working frequency signal generator |
Jan. 3, 2006 |
| 6963236 |
Method and apparatus for generating and controlling a quadrature clock |
Nov. 8, 2005 |
| 6917232 |
Method and apparatus for generating a quadrature clock |
Jul. 12, 2005 |
| 6903591 |
Phase shifter circuit |
Jun. 7, 2005 |
| 6891440 |
Quadrature oscillator with phase error correction |
May. 10, 2005 |
| 6873198 |
Tunable quadrature phase shifter |
Mar. 29, 2005 |
| 6831497 |
Active quadrature signal generator using load having low-pass and high-pass filter characteristics |
Dec. 14, 2004 |
| 6822496 |
Integrated circuit device implementing 90-degree phase shifter capable of generating output signals having phase difference therebetween at improved accuracy |
Nov. 23, 2004 |
| 6812763 |
Automatic wideband quadrature frequency generator |
Nov. 2, 2004 |
| 6768364 |
Quadrature signal generation with phase error correction |
Jul. 27, 2004 |
| 6747499 |
Tunable quadrature phase shifter using an all-pass circuit |
Jun. 8, 2004 |
| 6680639 |
Phase shifting arrangement for generating mutually orthogonal signals |
Jan. 20, 2004 |
| 6677796 |
Method and apparatus for implementing precision time delays |
Jan. 13, 2004 |
| 6665353 |
Quadrant switching method for phase shifter |
Dec. 16, 2003 |
| 6661851 |
Bi-directional vector rotator |
Dec. 9, 2003 |
| 6597747 |
Baseband signal processing circuit capable of accurately setting phase difference between analog I signal and analog Q signal to 90 degrees |
Jul. 22, 2003 |
| 6400778 |
DC-offset canceller |
Jun. 4, 2002 |
| 6385442 |
Multiphase receiver and oscillator |
May. 7, 2002 |
| 6340908 |
Phase adjusting circuit, scaling signal generation circuit using phase adjusting circuit, and position measuring apparatus using scaling signal generation circuit |
Jan. 22, 2002 |
| RE37452 |
At frequency phase shifting circuit for use in a quadrature clock generator |
Nov. 20, 2001 |
| 6313680 |
Phase splitter |
Nov. 6, 2001 |
| 6271738 |
90.degree. phase generator |
Aug. 7, 2001 |
| 6253066 |
Apparatus and method for producing a plurality of output signals with fixed phase relationships therebetween |
Jun. 26, 2001 |
| 6239661 |
Transmitter and an oscillator network for use in the transmitter |
May. 29, 2001 |
| 6211708 |
Frequency doubling circuits, method, and systems including quadrature phase generators |
Apr. 3, 2001 |
| 6160434 |
Ninety-degree phase shifter |
Dec. 12, 2000 |
| 5963073 |
.pi./2 phase shifter |
Oct. 5, 1999 |
| 5949267 |
Circuit arrangement for generating signals with different phases |
Sep. 7, 1999 |
| 5942929 |
Active phase splitter |
Aug. 24, 1999 |
| 5939916 |
Phase shifter suitable for clock recovery systems |
Aug. 17, 1999 |
| 5930689 |
Apparatus and method for producing a plurality of output signals with fixed phase relationships therebetween |
Jul. 27, 1999 |
| 5914623 |
90.degree.-phase shifter |
Jun. 22, 1999 |
| 5896053 |
Single ended to differential converter and 50% duty cycle signal generator and method |
Apr. 20, 1999 |
| 5815020 |
Balance differential receiver |
Sep. 29, 1998 |
| 5808498 |
At frequency phase shifting circuit for use in a quadrature clock generator |
Sep. 15, 1998 |
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