Low-current radio-frequency transceiver for use in short-range duplex communications applications
First Claim
1. A radio-frequency transceiver having a receiver circuit and a transmitter circuit, comprising:
- two batteries in series providing a primary current source to the transmitter circuits of said transceiver;
a center-tap disposed between said two batteries for providing a lower-voltage current source to at least one power-consuming element of the receiver circuits;
wherein the transmitter circuit is arranged such that current draining from the transmitter circuit acts as a current source for said at least one power-consuming element of the receiver circuit, and having a power control circuit with a lowered-current-consumption sleep mode and a normal-current-consumption operational mode.
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Accused Products
Abstract
A low-current transceiver, powered by two small low-voltage batteries, for use in wireless headset/phoneset applications, such as hands-free headsets used with cellular telephones. Re-use of current from at least one circuit to provide power to at least one other power-consuming element of the transceiver, along with interrupt-driven control of the current made available to transmit and receive circuits, enables extended battery life (e.g., 120 hours). The headset/phoneset circuits incorporate a technique that draws an extremely low supply current from two low-voltage batteries while providing clear two-way communication over a range of about 3 meters.
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Citations
21 Claims
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1. A radio-frequency transceiver having a receiver circuit and a transmitter circuit, comprising:
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two batteries in series providing a primary current source to the transmitter circuits of said transceiver; a center-tap disposed between said two batteries for providing a lower-voltage current source to at least one power-consuming element of the receiver circuits; wherein the transmitter circuit is arranged such that current draining from the transmitter circuit acts as a current source for said at least one power-consuming element of the receiver circuit, and having a power control circuit with a lowered-current-consumption sleep mode and a normal-current-consumption operational mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A battery-powered radio-frequency transceiver, comprising:
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a receiver circuit and a transmitter circuit, said transmitter circuit having means to reduce its own battery power consumption; and control means for controlling the connection of DC power to said transmitter and receiver circuits; wherein when said receiver circuit is powered by DC current, said receiver circuit detects the presence or absence of a received RF carrier signal. - View Dependent Claims (19, 20, 21)
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Specification