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US 2006/0189287 A1Published application
Remote control system
AssigneeKoninklijke Philips Electronics N.V.
InventorsYeow Toh, Kam Kwong
Life of this patent
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AssigneeKoninklijke Philips Electronics N.V.
InventorsYeow Toh, Kam Kwong
Estimating the term…
Transmitters (1) of remote control systems are provided with surfaceacoustic-wave-resonators (42) and receivers (2) are provided with variable inductors (54,79) for aligning the receiver, to optimise the performance versus the costs. A receiver oscillating-filtering circuit (24) comprises a single transistor (74), capacitors (76,77) and a variable inductor (79) to create a kind of “filtering” oscillator. A receiver ripple rejecting circuit (25) improves the operation of the receiver oscillating-filtering circuit 24 and of a receiver amplifying circuit (23) comprising a cascade design of two transistors (66,67). A receiver filtering circuit (26) between the receiver oscillatingfiltering circuit (24) and a receiver amplifying-shaping circuit (27) improves the operation of the latter. A transmitter oscillating-amplifying circuit (12) comprises a single power transistor (46) operating as a Colpitts oscillator. The remote control system avoids ceramic-resonators and chokes, and the receiver (2) avoids surfaceacoustic-wave-resonators. Power consumption is minimised.
A remote control system comprising a transmitter (1) and a receiver (2), which transmitter (1) comprises—a transmitter oscillating-amplifying circuit (12) comprising a surface-acoustic-wave-resonator (42);
A transmitter (1) for use in a remote control system comprising the transmitter (1) and a receiver (2), which transmitter comprises—a transmitter oscillating-amplifying circuit (12) comprising a surface-acoustic-wave-resonator (42);
A receiver (2) for use in a remote control system comprising a transmitter (1) and the receiver (2), which receiver (1) comprises—a receiver antenna (21) coupled to a receiver amplifying circuit (23) and to a first inductor (54);—a receiver oscillating-filtering circuit (24) coupled to the receiver amplifying circuit (23) and comprising a second inductor (79);
A method for use in combination with a remote control system comprising a transmitter (1) and a receiver (2), which transmitter (1) comprises—a transmitter oscillating-amplifying circuit (12) comprising a surface-acoustic-wave-resonator (42);
Dependencies are inferred from the claim text.