Receiver with baseband I and Q demodulator

Details Receiver with baseband I and Q demodulator Receiver with baseband I and Q demodulator

1997-02-10

2000-03-07

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375324, 375328, 708490, 708801, H04L 2706

Patent

active

060350059

ABSTRACT:
A baseband demodulator receives inphase and quadrature signals I (116) and Q (117) representing a phase angle and amplitude. The demodulator (114) includes a discrete time continuous amplitude circuit (223, 253, 260) coupled to the quadrature generator to extract a sign information by processing the quadrature components (116 and 118). An accumulator 404 uses the sign information to manipulate predetermined phase angles stored at a memory component 402 to determine the phase angle carried by the I and Q components (116 and 118). As such, the need for up converters or complex analog-to-digital converters is eliminated in direct conversion receivers.

REFERENCES:
patent: 4439756 (1984-03-01), Shenoi et al.
patent: 4521892 (1985-06-01), Vance et al.
patent: 4583239 (1986-04-01), Vance
patent: 5150324 (1992-09-01), Takasuka et al.
patent: 5222253 (1993-06-01), Heck
patent: 5668749 (1997-09-01), Corleto et al.
Seyfi Bazarjani et al., A 1V Switched-Capacitor delta-sigman Modulator, IEEE Conference, P70-71, Jun. 1995.

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