Abstract:
PROBLEM TO BE SOLVED: To provide a balanced oscillator that can reduce the current consumption and attain downsizing and to provide an electronic apparatus employing the same. SOLUTION: The balanced oscillator includes: a differential oscillation circuit 2 having two outputs; and a differential amplifier circuit 11 to two inputs of which two outputs of the differential oscillation circuit 2 are connected respectively, a DC current path of the differential amplifier circuit 11 and a DC current path of the differential oscillation circuit 2 are connected in series. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To suppress the variation of an oscillation frequency accompanying the on/off control of output buffers, in a crystal oscillator for which a crystal piece functioning as a crystal vibrator and an IC chip provided with at least an oscillation circuit using the crystal piece are housed in a container and integrated and the plurality of output buffers are provided inside the IC chip.SOLUTION: In an IC chip 20, an oscillation circuit 22 is connected to a crystal vibrator 10 through a pair of crystal connection terminals X1, X2, and output of the oscillation circuit 22 is supplied to output buffers 31, 32. In the view from the crystal connection terminal X2 having a phase opposite to that of output of the on/off controllable output buffer 32, an output terminal of the output buffer 32 is disposed farther than an output terminal of the output buffer 31 that is not subjected to the on/off control.
Abstract:
PROBLEM TO BE SOLVED: To provide an oscillator suppressing variations in electric power and C/N ratio of output signals by oscillation frequencies. SOLUTION: The oscillator includes: oscillation units 11 to 1n outputting oscillation signals of different frequencies; a transmission line 15 to which outputs of the oscillation units 11 to 1n are connected, the transmission line having a characteristic impedance corresponding to an output impedance of an output terminal Tout; and a low-pass filter 18 connected between the transmission line 15 and the output terminal. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an LC resonant circuit for an oscillator with reduced fluctuation of a frequency conversion gain, and an oscillator and information equipment using the same. SOLUTION: The LC resonant circuit of the oscillator includes a parallel circuit of an inductor L1, a first fine adjustable capacitor and a first capacitor bank, and a series capacitor of a second fine adjustable capacitor and a second capacitor bank. A frequency conversion gain of the oscillator is the sum of a frequency conversion gain of the oscillator based upon the first fine adjustable capacitor which decreases according to increase of a capacitance value of the first capacitor bank, and a frequency conversion gain based upon the second fine adjustable capacitor which increases according to increase of a capacitance value of the second capacitor bank. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a variable capacity circuit capable of maximizing the variable capacity width of a varactor without increasing the element area of the varactor nor converting the level of a control voltage even at a low source voltage, and a control method for variable capacity. SOLUTION: The variable capacity circuit 2 is equipped with a capacity value control circuit 11, varactors VA1 and VA2, and resistance elements R1 and R2. The capacity value control circuit 11 outputs a variable output voltage CNTOUT according to an input control voltage VT to control potentials at both ends of the varactors at the same time. The output voltage CNTOUT is variably adjusted to have negative correlation with the control voltage VT. The variation width of the voltage VD between terminals can be expanded from a variation width SA1 to a variation width SA1a (a range of ±(Vcc1)). Consequently, the variation area of the varactor capacity value CV can be widened from a variation area CA1 to a variation area CA1a as shown in lower Fig. 5B in Fig. 5. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an oscillator capable of outputting an oscillation signal efficiently. SOLUTION: The oscillator includes: a resonant circuit 31 for generating a resonant signal; a drive circuit 32 that feeds back the resonant signal to the resonant circuit, and an output terminal 37 connected to a given node of the resonant circuit, an oscillation signal of the oscillator outputted via the output terminal. The resonance circuit includes an inductor 33, and the output terminal 37 is connected to one end of the inductor 33. Or the output terminal 37 is connected to an intermediate node of the inductor located between both ends of the inductor 33. COPYRIGHT: (C)2005,JPO&NCIPI