摘要:
In accordance with a loop open/close control signal, an analog switch 60 can close or open a loop which consists of a voltage controlled oscillator 1, a variable frequency divider 2, a phase comparator 3, a first loop filter 451, the analog switch 60, and a second loop filter 452. In order to reduce the change of frequency caused when the open loop state is set immediately after the output frequency is changed, the second loop filter 452 uses a capacitor which shows properties of a small change of the capacitance in response to an applied voltage and a small hysteresis. In order to reduce the change of frequency caused when the open loop state is set immediately after the output frequency is changed, furthermore, a second diode one terminal of which is grounded is connected in reverse parallel to a first diode switch which switches the output oscillation frequency ranges of the voltage controlled oscillator.
摘要:
A coupled capacitor substrate (102, 413, 502, 603) having thereon a plane capacitor (109=103+104) is integrally bonded on a dielectric resonator (101, 401, 501, 601); and a varactor (108, 408, 508, 608) is mounted on the coupled capacitor substrate so as to couple the dielectric resonator via the plane capacitor (103+104).
摘要:
A high-Q inductor for high frequency, having a plurality of inductor elements formed in a plurality of IC wiring layers with a connection formed therebetween. The directions of the magnetic fields generated by the respective inductor elements are substantially the same. With this construction, the section of the inductor is increased reducing the serial resistance component and an influence of a skin effect in a high-frequency range is eliminated increasing the Q value.
摘要:
A transmitting-receiving switch, which can reduce the loss of reception while maintaining the same characteristics of transmission, can be implemented by comprising: an antenna terminal 101 connected to the antenna; a transmission terminal 102 connected to the transmission circuit; a reception terminal 103 connected to the receiving circuit; a control terminal 104 for applying a voltage; the first diode 106 of which the cathode is connected to the transmission terminal end and of which the anode is connected to the antenna terminal end and the control terminal end; a strip line 109 connected between the antenna terminal and the reception terminal; and the second diode 117 of which the anode is connected to a point between the strip line and the reception terminal and of which the cathode is connected to the ground.
摘要:
A time division multiple access FDD wireless unit has a first local oscillator 8 for oscillating a first frequency; a second local oscillator 12 for oscillating a second frequency; a n-times multiplier 14 for multiplying the second frequency by n; a m-times multiplier 18 for multiplying the second frequency by m; a converter 6 for transmitting frequency of difference between a reception signal and an output of the first local oscillator 8; a converter 11 for transmitting frequency of sum or difference between an output of the converter 6 and an output of the n-times multiplier 14; modulator 19 for modulating an output of the m-times multiplier 18; a converter 22 for transmitting frequency of sum of an output of the modulator 19 and the output of m-times multiplier 18.
摘要:
A transmitting-receiving switch, which can reduce the loss of reception while maintaining the same characteristics of transmission, can be implemented by comprising: an antenna terminal 101 connected to the antenna; a transmission terminal 102 connected to the transmission circuit; a reception terminal 103 connected to the receiving circuit; a control terminal 104 for applying a voltage; the first diode 106 of which the cathode is connected to the transmission terminal end and of which the anode is connected to the antenna terminal end and the control terminal end; a strip line 109 connected between the antenna terminal and the reception terminal; and the second diode 117 of which the anode is connected to a point between the strip line and the reception terminal and of which the cathode is connected to the ground.