Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1994-10-12
1997-10-14
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455302, 327113, 327175, H04B 116
Patent
active
056782225
ABSTRACT:
A time-share mixer circuit and a frequency converter, an I-Q modulator, and an I-Q demodulator. A switching signal drives the time-share mixer circuit to alternate between two output signals. The first output signal represents the output of a mixer having a given signal input and a local oscillator signal with a first phase as its local oscillator input. The second output signal represents the output of the mixer having the same input signal and the local oscillator signal with a second phase that differs from the first phase by 90 degrees as its local oscillator input signal. The frequency converter uses the time-share mixer in combination with a switched output phase shifter that switches in sync with the phase of the local oscillator signal to generate a phase shifted output signal in which the time average of an undesired image signal is substantially reduced compared to time average of the desired signal. The phase shifted output signal is then amplified by a bandpass amplifier. A clocked inverter in series with one of the mixer ports provides improved performance by eliminating the need for two precisely phase-shifted local oscillator signals.
REFERENCES:
patent: 3614627 (1971-10-01), Runyan
patent: 4119926 (1978-10-01), Frosch et al.
patent: 4320531 (1982-03-01), Dimon
patent: 4321549 (1982-03-01), Hansen
patent: 4545061 (1985-10-01), Hileman
Grzegorek Andrew Z.
Hornak Thomas
McFarland William J.
Walker Richard C.
Willingham Scott D.
Hewlett--Packard Company
Urban Edward F.
LandOfFree
Modulation and frequency conversion by time sharing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modulation and frequency conversion by time sharing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modulation and frequency conversion by time sharing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1563343