Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Socionext Inc.

Matsushita Electric Industrial Co., Ltd.

Yosuke Mitani

Kazuo Matsukawa

Shiro Dosho

Koji Obata

Masao Takayama

Takashi Morie

Shunsuke Hirano

Kaoru Ishida

Toshihiko Ohashi

Masashi Uchida

An integrator including: a resistive element connected to an input terminal; an operational amplifier configured to receive, through the resistive element, an input signal that has been supplied to the input terminal; and a voltage regulator circuit connected to an intermediate node between the resistive element and the operational amplifier. The voltage regulator circuit has a first current source connected to the intermediate node, and a switch connected between the intermediate node and the first current source and selectively turning ON or OFF.

Integrator, delta-sigma modulator, and communications device

This D/A converter includes a plurality of D/A converter elements, each comprising current sources configured to supply output currents to output nodes, and first switches configured to control the output currents. The output nodes are connected to a capacitor section having second switches and a capacitive load. The D/A converter further includes a switch control circuit configured to control the first switches responsive to digital signals, and also control the second switches in accordance with the control of the ON/OFF state of the first switches.

Current type D/A converter, delta sigma modulator, and communications device

DEM circuit () includes a switch () configured to receive an N-bit digital input signal (SD) and shift bit positions of the digital input signal (SD) based on a switch control signal (SC) in a circulating pattern to output the digital input signal (SD) as an N-bit digital output signal (SD), where N is an integer greater than or equal to 2, and a switch control signal generation circuit () including a plurality of pointers which move in an identical direction based on a predetermined rule, and configured to generate the switch control signal (SC), each time when the digital input signal (SD) is input to the switch (), by using the pointers in a predetermined order.

DEM circuit, delta-sigma modulator, D/A converter, and wireless communication device

A delta sigma modulator includes a filter circuit including an integrator having an operational amplifier; a first addition circuit provided between an output section of the filter circuit and an input section of a quantizer, and including a first resistive element; and a second addition circuit including at least one of a first feedforward circuit including a second resistive element or a first feedback circuit configured to feed back, as an analog signal, a digital output signal having been quantized by the quantizer, to an input section of the quantizer, wherein at least one of the first addition circuit or the first feedback circuit includes a phase compensator.

Delta sigma modulator, as well as receiver device and wireless communication device provided with same

Two resistive elements and a capacitive element are coupled between a first node and each of an inverting input terminal of an operational amplifier, an output terminal of the operational amplifier, and a common node. A resistive element and a capacitive element are coupled between the first node and a signal input terminal. Two capacitive elements and a resistive element are coupled between a second node and each of the inverting input terminal, the output terminal, and the common node. Two capacitive elements are coupled between the second node and each of the signal input terminal, and the common node.

Resonator and oversampling A/D converter

An oversampling A/D converter includes a first filter including a first resistive element, a first capacitive element, a second resistive element, an operational amplifier, and a second capacitive element; a second filter receiving an output of the first filter; a third filter including a third resistive element, a third capacitive element, and a fourth resistive element; a quantizer receiving an output of the third filter and generating a digital signal; and a D/A converter converting the digital signal to an analog current signal. The D/A converter inputs the generated analog current signal to an inverting input terminal of the operational amplifier.

Oversampling A/D converter

A delta-sigma modulator includes: an integrator having an operational amplifier; a quantizer quantizing an output of the integrator; a first D-A converter converting an output of the quantizer to a current signal to provide negative feedback to the operational amplifier; a feedforward path feeding forward an input of the integrator to the quantizer; and a second D-A converter converting the output of the quantizer to a current signal to provide negative feedback to the quantizer. The integrator includes a resistive element having a first end connected to the input of the integrator and a second end connected to an inverting input of the operational amplifier, n capacitive circuits connected in series between the inverting input and an output of the operational amplifier, and (n&#x2212;1) resistive elements each having a first end connected to an interconnecting node of the capacitive circuits and a second end connected to a common node.

Delta-sigma modulator, integrator, and wireless communication device

A delta-sigma A/D converter includes a loop filter including a resonant filter, a quantizer, and a feedback D/A converter. The resonant filter includes a resonator including a resistor and a capacitor, and a feedback path through which an output of the resonator is positively fed back to an input of the resonator. The resonant filter operates as an oscillator or a filter under the on/off control of a first switch. At least one of the resistor and the capacitor of the resonator is configured to allow a resistance value or a capacitance value thereof to be adjusted based on a third external signal.

Resonant filter, delta-sigma A/D converter, and semiconductor device

Two T filters, one of which includes two resistive elements and one capacitive element and the other of which includes two capacitive elements and one resistive element, are inserted in a negative-feedback section of an operational amplifier, and a resistive element and a capacitive element are connected between each of intermediate nodes and a signal input terminal. A resistive element and a capacitive element which are connected to each other in parallel are connected between the signal input terminal and an inverting input terminal of the operational amplifier. With this configuration, overall admittances where elements connected to the corresponding intermediate nodes are in parallel connection are equal to each other.

Resonator, delta-sigma modulator, and wireless communication device

An integrator includes an operational amplifier, a first filter connected to an inverting input terminal of the operational amplifier, and a second filter connected between the inverting input terminal and an output terminal of the operational amplifier. The first filter includes n resistive elements connected in series, and (n&#x2212;1) capacitive elements each having one end connected to an interconnecting node of the resistive elements and the other end connected to ground. The second filter includes n capacitive elements connected in series, and (n&#x2212;1) resistive elements each having one end connected to an interconnecting node of the capacitive elements and the other end connected to ground.

Integrator, resonator, and oversampling A/D converter

Provided are a PLL modulation circuit, a radio transmission device, and a radio communication device capable of maintaining a modulation accuracy for modulation of a wide band. The PLL modulation circuit () includes: a PLL unit (), first modulation signal input means for inputting a first modulation signal to a divider () or a phase comparator () of the PLL unit (); second modulation signal input means for DA converting the digital modulation signal in a DA converter () to generate an analog second modulation signal and inputting it to a voltage control oscillator () of the PLL unit (); a second divider for dividing the output signal of the voltage control oscillator (); and control means for generating a center frequency control signal, a gain control signal, and a second division ration control signal according to the channel selection signal and the control voltage inputted to the voltage control oscillator () and supplying them to the divider (), the DA converter (), and the second divider (), respectively.

PLL modulation circuit, radio transmission device, and radio communication device

A power supply device for vehicles is disclosed, which device includes a backup unit to the power supply as an auxiliary power supply employing a capacitor unit formed of plural capacitors. The auxiliary power supply includes a power supply section allowing the capacitor unit to power an electronic controller, and a compulsory operating section for operating the power supply section. An operating status of the power supply section is monitored even when a battery operates normally, so that the power supply device for vehicles with higher reliability and improved safety is obtainable.

Power supply device for vehicle

First and second calibration signals () are sent to a frequency divider () and an adder () of a PLL section (A), demodulated in a demodulator (), filtered through a low pass filter () and a high pass filter () and thereafter sent to a modulation signal control circuit (). The modulation signal control circuit () generates control information () in comparison with the phase and amplitude of the first and second calibration signals (and) and sends the control information () to a modulation control signal generator (). Modulation control signal generator () holds the control information () and controls the values of the first modulation signal and second modulation signal sent to the frequency divider () and adder () on the based on the control information () held in modulation operation.

Growing community of inventors

Osaka, Japan

Yosuke Mitani