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US 9,311,812 B2Granted
Transmitter and transceiver having the same in an RFID system
AssigneeFavepc Inc.
InventorsChun-Liang Tsai, Shao-Chang Chang
Life of this patent
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Abstract
A transmitter in an RFID system, the transmitter includes a signal generator which has a PIN diode and generates a first signal, a directional unit connected to a cathode of the PIN diode; and an antenna connected to the directional unit, wherein the signal generator has a first terminal configured to receive a first control signal to control a frequency band of the first signal and a second terminal configured to receive a second control signal to control a modulation depth of the first signal.
Claims4
A transmitter in an RFID system, the transmitter comprising:
- a signal generator comprising:
- a carrier generator;
- an amplifier to receive a carrier signal from the carrier generator;
- a PIN diode having an anode connected to an output of the amplifier;
- and
- a bias circuit having a first terminal to receive a first control signal to control a frequency band of the carrier signal, a second terminal connected to an anode of the PIN diode and the output of the amplifier, and a third terminal connected to a cathode of the PIN diode;
- and a fourth terminal to receive a second control signal to control a modulation depth of the carrier signal, and
- a directional unit connected to the cathode of the PIN diode, and
- wherein the amplitude of the carrier signal is changed to perform an amplitude-shift-keying (ASK) modulation on the carrier signal according to the first control signal, and the modulation depth of the carrier signal is changed between 0% and 100% according to the second control signal.
6 more elements
Dependencies are inferred from the claim text.