Apparatus for switching matching circuit in mobile communication terminal
AssigneeNEC Corporation
InventorMakoto Akiya
Life of this patent
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Abstract
An apparatus for switching a matching circuit in a mobile communication terminal includes a PIN diode connected in parallel to an RF signal input and output line to be turned on and off to connect and disconnect an impedance matching-element to the RF signal input and output line in accordance with a frequency band switching-signal, and a bias circuit for generating a bias voltage applied to the PIN diode in accordance with the frequency band switching-signal, thereby shifting an amplitude of an RF signal to a positive side at an off-time of the PIN diode.
Claims8
An apparatus for switching a matching circuit in a mobile communication terminal, comprising:
- a PIN diode connected in parallel to an RF signal input and output line to be turned on and off to connect and disconnect an impedance matching-element to the RF signal input and output line in accordance with a frequency band switching-signal;
- and
- a bias circuit for generating a bias voltage applied to the PIN diode in accordance with the frequency band switching-signal, thereby shifting an amplitude of an RP signal to a positive side at an off-time of the PIN diode.
An apparatus for switching a matching circuit in a mobile communication terminal, comprising:
- an RF signal input and output line;
- a matching circuit for switching a frequency band of an RF signal;
- a switching circuit for connecting and disconnecting the matching circuit to the RF signal input and output line;
- and
- a bias circuit for adding a predetermined DC voltage to the RF signal.
Dependencies are inferred from the claim text.