摘要:
PROBLEM TO BE SOLVED: To provide a wireless unit including an IC chip and a substrate on which the IC chip is flip-chip mounted, that can optimize circuit characteristics when high frequency characteristics are varied due to IC chip process variation.SOLUTION: The wireless unit includes: a high frequency IC chip 100 for a microwave and millimeter waveband power amplifier; a bump 102; an input terminal 103; an output terminal 104; a substrate 105; an underfill 106; and a process variation detecting section 110. The process variation detecting section monitors variation in circuit characteristics due to process variation. The underfill 106 having a parameter calculated by using the monitored variation of the circuit characteristics is filled between the substrate 105 and the IC chip 100 for millimeter waveband power amplifier. In this manner, there is provided a wireless unit that can offer desired circuit characteristics under influences of the process variation and the underfill.
摘要:
PROBLEM TO BE SOLVED: To provide a voltage controlled oscillator that is configured by arranging C-coupling type variable capacitance circuits and a direct-coupling type variable capacitance circuit in a mixed manner and in which the linearity and the variable range of the oscillation frequency are well-balanced. SOLUTION: The voltage controlled oscillator includes an inductor circuit 110, C-coupling type variable capacitance circuits 120 and 140, a direct-coupling type variable capacitance circuit 130, and a negative resistance circuit 160, which are connected in parallel, and a reference voltage generating section 180 that generates reference voltages Vref1 and Vref2. A control voltage Vt for feedback control of an oscillation frequency is applied to back gate terminals of variable capacitance elements 121, 122, 131, 132, 141 and 142 of the variable capacitance circuits 120, 130 and 140. The reference voltages Vref1 and Vref2 are applied to gate terminals of the variable capacitance elements 121, 122, 141, and 142 of the C-coupling type variable capacitance circuits 120 and 140, respectively. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To obtain a constant effective radiation power level if dispersion in an antenna gain occurs in radio communication that handles a high frequency signal.SOLUTION: A variable gain amplifier amplifies a baseband signal. An orthogonal modulator performs orthogonal modulation on the amplified baseband signal to generate a high frequency signal. A power amplifier amplifies the generated high frequency signal. An antenna transmits the amplified high frequency signal. A detector detects the amplified high frequency signal. A first nonvolatile memory stores desired transmission power of the high frequency signal transmitted from the antenna. A control unit adjusts the gain of the variable gain amplifier according to the detector output and the transmission power stored in the nonvolatile memory.
摘要:
PROBLEM TO BE SOLVED: To provide a voltage-controlled oscillator that can hold an oscillation frequency at a desired value when an oscillation frequency changes due to the temperature, without narrowing a variable range of the oscillation frequency, and a PLL circuit, an FLL circuit and a wireless communication device, which use the voltage-controlled oscillator. SOLUTION: A control voltage Vt is applied to a connection point Y between variable capacitors 121 and 122 included in a variable capacitance circuit 120. A control signal Fsel is applied to a switching element 132 included in a capacitance switching circuit 130. A power-supply voltage Vdd is applied by a control section 170 to a connection point X between inductors 111 and 112 included in an inductor circuit 110. A voltage value of the power-supply voltage Vdd is controlled such that the oscillation frequency of a local oscillation signal is held at a constant regardless of a temperature change. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a wireless communication device capable of obtaining a high-frequency transmission signal of desired power even when a threshold voltage of a transistor deviates from a desired value.SOLUTION: In a wireless communication device 1000, each of baseband variable gain amplifiers 507a and 507b amplifies a baseband signal. Each of mixers 504a and 504b converts the amplified baseband signal into a high-frequency transmission signal. Each of hybrid variable gain amplifiers 505a and 505b amplifies an in-phase local signal and an orthogonal local signal which are input to the mixers 504a and 504b. A level detection control section 514 controls the baseband variable gain amplifiers 507a and 507b and the hybrid variable gain amplifiers 505a and 505b, respectively, to the gain according to the power of the high-frequency transmission signal.
摘要:
PROBLEM TO BE SOLVED: To provide a small size radio communication apparatus capable of properly starting up at power ON.SOLUTION: A radio communication apparatus includes: a BBIC that performs a baseband signal processing; an RFIC that performs a high frequency signal processing; and a crystal oscillator. The RFIC has: a storage that holds adjustment values for adjusting the frequency of a clock signal based on the oscillation frequency of the crystal oscillator and outputs an adjusted value when a reset is released from the active state; a frequency adjustment section that adjusts the frequency of the clock signal according to the adjustment value stored in the storage; and an RF signal processing section that performs a high frequency signal processing according to the clock signal. The clock signal which is output from an oscillation circuit including the crystal oscillator and the frequency adjustment section is supplied to the RF signal processing section and the BBIC. The BBIC controls the reset of the storage and the reset of the baseband signal processing made by the BBIC.
摘要:
PROBLEM TO BE SOLVED: To provide a PLL oscillation circuit that can reduce the variability of modulation sensitivity of a VCO 101 and obtain a desired output amplitude quickly with high precision. SOLUTION: An amplitude detector 103 detects an output amplitude of the VCO 101. An amplitude controller 105 controls a current value of a variable current source 109 so as to have an output amplitude of the VCO 101 detected by the amplitude detector 103 to be a desired amplitude. An LPF 108 is connected between the amplitude controller 105 and the variable current source 109. A switch 107 connects or disconnects the LPF 108 between the amplitude controller 105 and the variable current source 109. The amplitude controller 105 is connected to the variable current source 109 through either the LPF 108 or the switching switch 107. COPYRIGHT: (C)2010,JPO&INPIT