Electric component for communication device and semiconductor device for switching transmission and reception
First Claim
1. An electronic component for communication, comprising:
- a first power amplification circuit for amplifying an RF signal in a first frequency band to be transmitted;
a second power amplification circuit for amplifying an RF signal in a second frequency band to be transmitted;
a first terminal connected to a transmission/reception antenna;
a second terminal connected to a first reception circuit for processing a received RF signal in the first frequency band;
a third terminal connected to a second reception circuit for processing a received RF signal in the second frequency band;
a first switch circuit provided between said first terminal and said first power amplification circuit and between said first and second terminals; and
a second switch circuit provided between said first terminal and said second power amplification circuit and between said first and third terminals, wherein a transistor constituting said first switch circuit and a transistor constituting said second switch circuit have respective characteristics different from each other such that an insertion loss of the first switch circuit and an insertion loss of the second switch circuit are balanced.
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Accused Products
Abstract
There are provided a transmission/reception switching circuit which is small in insertion loss and harmonic distortion and allows an increase in the output power of a power amplifier and an electronic component for communication on which the transmission/reception switching circuit is mounted. As an element composing a transmission/reception switching circuit in a wireless communication system, series-connected FETs or a multi-gate FET are used in place of a diode. Gate resistors connected between the individual gate terminals and a control terminal are designed to have resistance values which become progressively smaller from the gate to which a highest voltage is applied toward the gate to which a lowest voltage is applied.
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Citations
12 Claims
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1. An electronic component for communication, comprising:
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a first power amplification circuit for amplifying an RF signal in a first frequency band to be transmitted;
a second power amplification circuit for amplifying an RF signal in a second frequency band to be transmitted;
a first terminal connected to a transmission/reception antenna;
a second terminal connected to a first reception circuit for processing a received RF signal in the first frequency band;
a third terminal connected to a second reception circuit for processing a received RF signal in the second frequency band;
a first switch circuit provided between said first terminal and said first power amplification circuit and between said first and second terminals; and
a second switch circuit provided between said first terminal and said second power amplification circuit and between said first and third terminals, wherein a transistor constituting said first switch circuit and a transistor constituting said second switch circuit have respective characteristics different from each other such that an insertion loss of the first switch circuit and an insertion loss of the second switch circuit are balanced. - View Dependent Claims (2, 3, 4)
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5. An electronic component for communication, comprising:
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a first power amplification circuit for amplifying an RF signal in a first frequency band to be transmitted;
a second power amplification circuit for amplifying an RF signal in a second frequency band to be transmitted;
a first terminal connected to a transmission/reception antenna;
a second terminal connected to a first reception circuit for processing a received RF signal in the first frequency band;
a third terminal connected to a second reception circuit for processing a received RF signal in the second frequency band;
a first switch circuit provided between said first terminal and said first power amplification circuit and said second terminal; and
a second switch circuit provided between said first terminal and said second power amplification circuit and said third terminal, wherein a frequency in said second frequency band has been adjusted to be lower than a frequency in said first frequency band, and a first signal line formed between said second power amplification circuit and the second switch circuit to propagate the RF signal to be transmitted has been designed to be longer than a second signal line formed between said first power amplification circuit and the first switch circuit to propagate the RF signal to be transmitted.
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6. An electronic component for communication, comprising:
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a first power amplification circuit for amplifying an RF signal in a first frequency band to be transmitted;
a second power amplification circuit for amplifying an RF signal in a second frequency band to be transmitted;
a first terminal connected to a transmission/reception antenna;
a second terminal connected to a first reception circuit for processing a received RF signal in the first frequency band;
a third terminal connected to a second reception circuit for processing a received RF signal in the second frequency band;
a first switch circuit provided between said first terminal and said first power amplification circuit and said second terminal; and
a second switch circuit provided between said first terminal and said second power amplification circuit and said third terminal, wherein a specified dc voltage is applied via a resistor element to each of a signal input terminal of said first switch circuit to which the RF signal in said first frequency band to be transmitted is inputted, a signal input terminal of said second switch circuit to which the RF signal in said second frequency band to be transmitted is inputted, and said first terminal. - View Dependent Claims (7)
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8. A semiconductor device for switching transmission and reception, comprising:
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a first terminal connected to a transmission/reception antenna;
a second terminal connected to a transmission circuit;
a third terminal connected to a reception circuit;
first switching means provided between said first and second terminals; and
second switching means provided between said first and third terminals, said semiconductor device performing switching between a signal to be transmitted and a received signal through an ON/OFF operation of said first and second switching means, wherein said second switching means is comprised of a single multi-gate transistor or a plurality of transistors connected in series, respective resistor elements are connected between a plurality of gate terminals of the transistor or transistors and a control input terminal used commonly thereamong, and resistance values of the resistor elements are set such that the resistor element connected to the gate terminal closer to said first terminal has a larger resistance value. - View Dependent Claims (9, 10, 11, 12)
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Specification