摘要:
A two-point modulation type phase apparatus and a wireless communication apparatus capable of achieving a reduction in circuit scale and low power consumption while maintaining modulation precision. It is possible to provide a D/A converter (150) that converts the inputted digital baseband signal to an analog signal, an adder (110) that adds an output signal of a D/A converter (150) and an output of a loop filter (135) to output to a control voltage terminal of the voltage controlled oscillator (105), and a peak control section (140) provided at a front stage of the D/A converter (150) that carries out smoothing of peak portions appearing at the inputted digital baseband signal, at a two-point modulation type phase modulation apparatus (100) that modulates a-carrier frequency signal using an inputted digital baseband signal by setting a frequency dividing ratio of a frequency divider (115) of a PLL circuit based on an inputted digital baseband modulation signal, and adding a voltage corresponding to a signal that is an inputted digital baseband signal analog-converted for supply to a control voltage terminal of a voltage controlled oscillator (105).
摘要:
A frequency synthesizer (100) can selectively set an output band of VCO, and consumes less power. The frequency synthesizer (100) has a frequency converting circuit (110) that has a mixer (111) and a frequency divider (112) connected with each other in parallel. The frequency synthesizer (100) uses the frequency divider (112) upon frequency band selection in VCO (101) and uses the mixer (111) upon transmission.
摘要:
A problem of the present invention is to provide a wide band modulation PLL having good modulation accuracy at low cost. With respect to a PLL having a VCO (21), a frequency divider (22), a phase comparator (23), a charge pump (24) and a loop filter (25), the VCO (21) and a frequency dividing ratio of the frequency divider (22) are controlled to perform modulation. The VCO (21) has two control terminals for PLL and modulation, and a control signal generation part (28) generates a control voltage Vtm of the VCO (21) based on phase modulation data and an input voltage Vtl to the control terminal for PLL. At the time of adjusting a modulation factor, the control voltage Vtm to the control terminal for modulation of the VCO (21) is controlled and also the input voltage Vtl is measured and a modulation sensitivity of a frequency of the VCO (21) to Vtm is calculated and a modulation factor of the phase modulation data is adjusted based on the modulation sensitivity obtained.
摘要:
A fraction part control circuit of a frequency synthesizer apparatus including a PLL circuit is of a plural-n-th-order delta-sigma modulator circuit for controlling a fraction part of a number of frequency division to a variable frequency divider of the PLL circuit. An adder adds data of the fraction part to an output data from a multiplier and outputs the resultant data to a quantizer through a second-order integrator. The quantizer quantizes input data with a quantization step and outputs the quantized data to the multiplier through a feedback circuit. The quantized data is used as data of the controlled fraction part. The multiplier multiplies data from the feedback circuit by the quantization step and outputs the resultant data to the adder. The fraction part control circuit periodically changes the data of the fraction part, thereby setting a frequency of an output signal from a VCO according to an average value of the period.
摘要:
A frequency modulation apparatus 100 has a synthesizer 101, a differentiator 102 that differentiates phase modulation data and generates differential phase modulation data, an adder 103 that adds together that differential phase modulation data and carrier frequency data fractional part K and generates addition fractional part K1, an input data operation section 104 that receives addition fractional part K1 and carrier frequency data integer part M, generates integer part input data M1 and fractional part input data K2, and provides fractional part input data K2 to synthesizer 101, and an integer part data delay section 105 that delays integer part input data M1 before providing it to synthesizer 101. Input data operation section 104 makes M1=M−1 and K2=K1+1 when K1
摘要:
A frequency synthesizer device comprising a PLL circuit (9) and a frequency-division ratio control circuit (5). The PLL circuit (9) includes a phase comparator (1), a low-pass filter (2), a voltage-controlled oscillator (3), and a variable frequency divider (4). The frequency-division ratio control circuit (5) controls the variable frequency divider (4) such that a frequency division ratio of the variable frequency divider (4) is changed in time and a time average value of the frequency division ratio contains a value below a decimal point. Two different signals of an output signal fdiv of the variable frequency divider (4) and an output fdiv2 obtained via a delay element (10) are used as clocks of an accumulator portion (81) in the frequency-division ratio control circuit (5). The variation in the substrate potential and the variation in the power supply voltage generated by the operation of the frequency-division ratio control circuit (5) can be reduced, and the degradation of C/N of the frequency synthesizer can be suppressed.
摘要:
A wireless apparatus includes a clock generation PLL circuit of a digital baseband section. A variable output regulator receives as an input a VCO control voltage for controlling an oscillation frequency of a VCO in the PLL circuit, varies an output voltage in accordance with the VCO control voltage, and supplies, as a supply voltage, the output voltage to a power terminal of a high frequency circuit, such as an amplifier. The VCO control voltage changes in accordance with temperature or process variations, and the supply voltage of the high frequency circuit is controlled in accordance with the VCO control voltage. For this reason, performance deterioration ascribable to the temperature or process variations can be compensated for.
摘要:
A two-point modulation type phase apparatus and a wireless communication apparatus capable of achieving a reduction in circuit scale and low power consumption while maintaining modulation precision. It is possible to provide a D/A converter (150) that converts the inputted digital baseband signal to an analog signal, an adder (110) that adds an output signal of a D/A converter (150) and an output of a loop filter (135) to output to a control voltage terminal of the voltage controlled oscillator (105), and a peak control section (140) provided at a front stage of the D/A converter (150) that carries out smoothing of peak portions appearing at the inputted digital baseband signal, at a two-point modulation type phase modulation apparatus (100) that modulates a-carrier frequency signal using an inputted digital baseband signal by setting a frequency dividing ratio of a frequency divider (115) of a PLL circuit based on an inputted digital baseband modulation signal, and adding a voltage corresponding to a signal that is an inputted digital baseband signal analog-converted for supply to a control voltage terminal of a voltage controlled oscillator (105).
摘要:
A phase modulation apparatus is provided whereby excellent RF phase modulation signals can be obtained even when the modulation sensitivity of a voltage controlled oscillator varies. Phase modulation apparatus 100 has: phase detector 105 that performs phase detection with respect to an RF phase modulation signal outputted from VCO 101; comparator 106 that compares the phase of the detected signal with the phase of a baseband phase modulation signal and outputs the difference between the signals; variable gain amplifier 107 that controls the gain of the baseband phase modulation signal based on the output of comparator 106 and supplies the gain-controlled baseband phase modulation signal to VCO 101. By this means, the signal level of the baseband phase modulation signal that is supplied to VCO 101 can be controlled in accordance with the modulation sensitivity of VCO 101, so that phase modulation apparatus 100 can be realized whereby excellent RF phase modulation signals even when the modulation sensitivity of VCO 101 varies.
摘要:
A problem of the invention is to provide a wide band modulation PLL having an excellent modulation accuracy at low cost. With respect to a PLL portion including VCO (21), a divider (22), a phase comparator (23), and a loop filter (24), a dividing ratio of the divider (24) is modulated by a dividing ratio generating portion (29) by controlling a control voltage of VCO (21) by a control signal generating portion (30). VCO (21) includes two control terminals, and the control signal generating portion (30) inputs the control signal to one of the control terminals. In controlling a modulation degree, the dividing ratio generating portion (29) is inputted with a calibration data fc1 and the control signal generating portion (30) is inputted with a calibration data fc2. A demodulator (31) demodulates output signals of VCO (21) when the respective calibration data are inputted and modulation degree controlling means (32) outputs a modulation degree control signal to the control signal generating portion (30) based on the demodulated signals.