摘要:
The output from a digital signal amplitude regenerator circuit in which the amplitude of a transmitted burst data signal is amplified, and an initial potential generator circuit, are connected to a switch. While there are no burst data, the initial potential generator circuit provides a circuit for compensating for degradation in pulse width comprising a low-pass filter, a pulse width compensation threshold generator circuit, and a limiting amplifier, with an initial potential needed to set a threshold. When a carrier detection signal generator circuit detects the arrival of a burst data signal, a carrier detection signal is outputted, and the switch is switched over from the initial potential to the burst data signal. Thus, the circuit for compensating for the degradation in pulse width located at a later stage can detect a threshold from an optimal initial potential, and thereby the degradation in pulse width can be optimally compensated.
摘要:
A differential amplifier having an integrated resistance load type differential pair in which a constant current which varies to suppress a small signal gain variation of a resistance load type differential pair caused by variations of circumferential conditions and manufacturing process conditions and a constant current which varies to suppress a limiter amplitude variation of the resistance load type differential pair caused by the variations of the same conditions are mixed at a fixed ratio under a condition which is most frequently used among the circumferential conditions and a condition which is best achieved among the manufacturing process conditions, which is used as a bias current of the differential pair.
摘要:
A temperature measurement circuit for measuring a temperature using a temperature sensitive element includes a voltage control circuit configured to apply a control voltage to the temperature sensitive element. The temperature measurement circuit includes a first switching circuit configured to switch levels of the control voltage based on a current flowing through the temperature sensitive element. The temperature measurement circuit includes a conversion circuit configured to convert the current flowing through the temperature sensitive element into a voltage level corresponding to the measured temperature, by using predetermined conversion gain. The temperature measurement circuit includes a second switching circuit configured to switch values of the conversion gain based on the voltage level.
摘要:
A battery control circuit controls a balance of cell voltage values of cells coupled in series, and includes connection terminals respectively coupling to a positive electrode of a corresponding cell, a ground terminal coupled to an internal ground of the battery control circuit and coupling to a negative electrode of a cell located at a lowest stage of the cells, a control circuit to select, from the connection terminals, at least one connection terminal coupled to the internal ground via an internal current path of the battery control circuit, and a current generation circuit to supply a terminal current whose current value varies according to the cell voltage value of the cell whose positive electrode is coupled to the at least one of the connection terminals selected by the control circuit, from the at least one of the connection terminals to the internal ground via the internal current path.
摘要:
A secondary battery protection system including a plurality of secondary battery protection apparatuses, wherein the system comprises: a first secondary battery protection apparatus, which is connected to a first secondary battery cell of the battery cells, comprising: a current transmission unit configured to generate and transmit a current transmission signal, a current value of the current transmission signal corresponding to the first condition being set; and a voltage determination unit configured to determine a voltage value of a voltage transmission signal; and a second secondary battery protection apparatus, comprising: a voltage transmission unit configured to generate and transmit the voltage transmission signal, a voltage value of the voltage transmission signal corresponding to the second condition being set; and a current determination unit configured to determine a current value of the current transmission signal; wherein the current transmission signal and the voltage transmission signal are transmitted sharing a single communication line.
摘要:
A battery protection circuit protects a rechargeable battery from overdischarge, by turning off a transistor inserted in series in a current path between a negative electrode of the battery and a negative terminal coupled to ground of a load or a charger. A detection circuit detects a power source voltage between power source and ground terminals, and a control circuit pulls down a monitor terminal potential to a ground terminal potential by turning off the transistor and stopping battery discharge when the power source voltage lower than an overdischarge detection voltage is detected. The control circuit cancels pull-down of the monitor terminal potential to the ground terminal potential when the power source voltage higher than an overdischarge reset voltage is not detected until a predetermined time elapses in a state in which the battery discharge is stopped and the monitor terminal potential is pulled down to the ground terminal potential.
摘要:
A secondary battery protection system including a plurality of secondary battery protection apparatuses, wherein the system comprises: a first secondary battery protection apparatus, which is connected to a first secondary battery cell of the battery cells, comprising: a current transmission unit configured to generate and transmit a current transmission signal, a current value of the current transmission signal corresponding to the first condition being set; and a voltage determination unit configured to determine a voltage value of a voltage transmission signal; and a second secondary battery protection apparatus, comprising: a voltage transmission unit configured to generate and transmit the voltage transmission signal, a voltage value of the voltage transmission signal corresponding to the second condition being set; and a current determination unit configured to determine a current value of the current transmission signal; wherein the current transmission signal and the voltage transmission signal are transmitted sharing a single communication line.
摘要:
A wavelength selective switch for suppressing degradation of pass band characteristics when the temperature rises. The wavelength selective switch includes a spectroscopic element for separating input light and providing angular dispersion depending on wavelengths, a collective lens for gathering light output from the spectroscopic element, and a movable reflection block which includes a plurality of mirrors arranged in the direction of angular dispersion made by the spectroscopic element, changes the angles of the mirrors in a direction differing from the direction of angular dispersion, and reflects the light coming from the collective lens. The collective lens is fixed at one end with respect to the direction of angular dispersion, expands with heat in a direction in which it is not fixed when the temperature rises, and outputs the light in a direction opposite to the direction in which the angle of light output from the spectroscopic element changes.
摘要:
There is provided a test apparatus for testing a plurality of devices under test. The test apparatus includes a signal input section that applies a test signal to the devices under test so as to cause the devices under test to concurrently output response signals, a combining section that generates a single combination signal by using the response signals output from the devices under test, and a judging section that judges whether the devices under test operate normally with reference to the combination signal.
摘要:
An optical device includes: an optical component; a case air-sealed, and made of metal, the optical component being secured within the case; and a lens provided within the case, and positionally adjusted in consideration of a deformation of the case air-sealed, light emitted from the optical component passing through the lens or light traveling to the optical component passing through the lens.