초록 ▼

A pneumatic tire monitoring system is disclosed which provides a pressure sensor/transponder unit for each pneumatic tire of a vehicle to monitor tire pressure. A coded signal transmitted from each transponder unit is received by a multi-purpose receiver which may provide information to the vehicle

A pneumatic tire monitoring system is disclosed which provides a pressure sensor/transponder unit for each pneumatic tire of a vehicle to monitor tire pressure. A coded signal transmitted from each transponder unit is received by a multi-purpose receiver which may provide information to the vehicle operator or to other vehicle systems and subsystems. Each transponder unit is characterized by ultra low power consumption to extend the useful battery life. The transponder units may be mounted within the vehicle tires, or externally mounted. Impedance matching circuitry allows the use of the wheel rims with the transmitting antenna so as to avoid doppler shift induced by the rotating antenna and frequency drift induced by capacitive coupling.

대표청구항 ▼

A super-regenerative receiver with compensation, the receiver comprising: an antenna for receiving a transmitted electromagnetic signal; a two-stage common-base amplifier having an input and an output, the input being operatively associated with the antenna; a transistor having a base, an emitter, a

A super-regenerative receiver with compensation, the receiver comprising: an antenna for receiving a transmitted electromagnetic signal; a two-stage common-base amplifier having an input and an output, the input being operatively associated with the antenna; a transistor having a base, an emitter, and a collector, the base being capacitively coupled to the output of the amplifier; a first inductor connected across the base and the collector of the transistor; a second inductor connected to the base of the transistor and capacitively coupled to the first inductor, the first and second inductors being inductively coupled out of phase so as to improve frequency stability of the system.