Receiver circuit
October 11, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDirect conversion FM receiver Directly mixing synchronous AM receiver Offset correction circuit Method for automatically compensating for accuracy degradation of a reference oscillator Direct conversion receiver for multiple protocols Apparatus and method for minimizing the turn on time for a receiver operating in a discontinuous receive mode Method and apparatus for using full spectrum transmitted power in a spread spectrum communication system for tracking individual recipient phase, time and energy Zero intermediate frequency receiver Phase shifter and communication system using the phase shifter Wide band zero if quadrature demodulator using a intermediate frequency and a single local oscillator Patent #: 5761615 InventorsApplicationNo. 730686 filed on 10/11/1996US Classes:455/324, Homodyne (i.e., zero beat or synchrodyne reception)375/319Automatic bias circuit for DC restorationExaminersPrimary: Vu, Huy D.Assistant: Lee, Chiho Andrew Attorney, Agent or FirmForeign Patent References
International ClassH04B 001/26Foreign Application Priority Data1995-10-11 GBAbstractA receiver circuit, particularly an integrated, zero IF receiver circuit in which a direct conversion IF stage is separated from an antenna by a further fequency conversion stage which is AC coupled to the direct conversion IF stage. A single crystal oscillator generates a frequency which is multiplied prior to being applied as a local oscillator signal to the further frequency conversion stage and is used to produce another frequency, which is divided to block harmonics, prior to being applied as quadrature related local oscillator signals to the direct conversion IF stage. The direct coversion IF stage includes several dc nulling for compensating for dc offsets.Other References
Field of SearchGENERALIZED ORTHOGONAL OR SPECIAL MATHEMATICAL TECHNIQUESWalsh functions Fourier transform Combining or distributing information via code word channels using multiple access techniques (e.g., CDMA) Signaling for performing battery saving Automatic bias circuit for DC restoration RECEIVERS Carrier recovery circuit or carrier tracking Plural signal paths in receiver Automatic frequency control Automatic gain control Plural local oscillators or mixers With synchronized or controlled local oscillator Homodyne (i.e., zero beat or synchrodyne reception) With frequency control With frequency synthesizer Frequency modifying or conversion Plural separate successive conversions | |
