Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Masaki Kanemaru

Hiroshi Tanaka

Taiji Akizuki

Yohei Morishita

Takahiro Shima

Kiyomichi Araki

Isao Imazeki

Tosiakira Andou

Hiroka Shiozaki

A detection calibration circuit includes a first distributor distributing a high frequency input signal, an amplifier amplifying the first high frequency output signal of the first distributor, a second distributor distributing the amplified first high frequency output signal of the first distributor, a reference signal generator outputting a reference signal in accordance with a switchable reference voltage, a switcher selecting a third high frequency output signal of the second distributor or a reference signal of the reference signal generator and outputting the selected signal, a detector detecting the third high frequency output signal of the second distributor or the reference signal of the reference signal generator from the switcher, a sensitivity switcher adjusting a sensitivity for an output signal of the detector, and a calibration control circuit adjusting a detection gain of an input signal of the detector and an input-output sensitivity for an output signal of the detector.

Detection calibration circuit and transmission apparatus

A polarity-switching amplifier circuit includes: a first amplifying transistor and a second amplifying transistor, a transformer which includes a primary winding and a secondary winding, and a polarity-switching controller. An unbalanced input signal is input to the first amplifying transistor and the second amplifying transistor. The transformer receives an output signal of the first amplifying transistor and an output signal of the second amplifying transistor as a balanced signal input to the primary winding, and outputs a signal from the secondary winding. The polarity-switching controller turns on one of the first amplifying transistor and the second amplifying transistor and turns off the other thereof.

Polarity-switching amplifier circuit

A variable matching circuit includes a transformer which is disposed between first and second transistor circuits. A primary inductor device and a secondary inductor device are magnetically coupled in the transformer. The primary inductor device is connected between an output terminal of the first transistor circuit and a bias circuit for the first transistor circuit. The secondary inductor device is connected between an input terminal of the second transistor circuit and a bias circuit for the second transistor circuit. Connection points between the primary inductor device and the bias circuit for the first transistor circuit and between the secondary inductor device and the bias circuit for the second transistor circuit are connected to first and second capacitive elements, respectively. At least one of inductance values of the respective primary and secondary inductor devices and capacitance values of the respective first and second capacitive elements is variable.

Variable matching circuit and amplifier

A protection circuit includes a transformer (), wherein a terminal () of the transformer () is connected to a terminal part () of a radio IC, a terminal () thereof is connected to a grounding point, a terminal () thereof is connected to an input or output of an on-chip circuit (), and a terminal () thereof is connected to a bias power supply circuit (). A signal is transmitted between a terminal-side inductor () and a circuit-side inductor () due to magnetic coupling therebetween. The terminal-side inductor and the circuit-side inductor are insulated to each other from a standpoint of DC and hence isolated completely to each other. Thus, different voltages can be applied to the terminal part () and the input or output of the on-chip circuit (), respectively.

Protection circuit

Semiconductor

The discrete time analog circuit () is provided with: a rotate capacitor circuit (); an amplifier () that is connected to the input line or the output line of the rotate capacitor (), and amplifies the input potential or input charge; a coefficient circuit () that is positioned in series with the amplifier (), and has two history capacitors (--) positioned parallel to each other; a first active capacitor among the two history capacitors (--) that is connected to and charges the amplifier (); and a clock generation circuit () that is connected to the input line or the output line without the involvement of the amplifier (), and that sequentially changes the pairing of the rotate capacitor circuit () a second active capacitor, which shares a charge with the rotate capacitor circuit ().

Growing community of inventors

Tokyo, Japan

Masaki Kanemaru