摘要:
An LC element, semiconductor device and a manufacturing method thereof whereby a channel 22 is formed by applying a voltage to a gate electrode 10 having a predetermined shape formed on a p-Si substrate 30 via an insulation layer 26, whereby a connection is formed between a first diffusion region 12 and a second diffusion region 14 formed at separated positions near the surface of the p-Si substrate 30; both the channel 22 and gate electrode 10 function as inductors, and between these a distributed constant type capacitor is formed, and possessing excellent attenuation characteristics over a wide band. This LC element and semiconductor device can be easily manufactured by using MOS manufacturing technology; in the case of manufacturing as a portion of a semiconductor substrate, component assembly work in subsequent processing can be omitted. Also these can be formed as a portion of an IC or LSI device.
摘要:
An LC element, semiconductor device and a manufacturing method thereof whereby a channel 22 is formed by applying a voltage to a gate electrode 10 having a predetermined shape formed on a p-Si substrate 30 via an insulation layer 26, whereby a connection is formed between a first diffusion region 12 and a second diffusion region 14 formed at separated positions near the surface of the p-Si substrate 30; both the channel 22 gate electrode 10 function as inductors, and between these a distributed constant type capacitor is formed, and possessing excellent attenuation characteristics over a wide band. This LC element and semiconductor device can be easily manufactured by using MOS manufacturing technology; in the case of manufacturing as a portion of a semiconductor substrate, component assembly work in subsequent processing can be omitted. Also these can be formed as a portion of an IC or LSI device.
摘要:
A tuning circuit which has a wide tuning bandwidth. The tuning bandwidth or the tuning frequency can be easily changed. The tuning circuit 1 is imposed of two cascade-connected tuning amplifier sections 2 and 3. Each of the sections 2 and 3 is provided with cascade-connected phase-shifting circuits 10C and 30C, a non-inverting circuit 50, a voltage dividing circuit 160, and an adding circuit composed of a feedback resistor 70 and an input resistor 74. Prescribed tuning operation is performed by shifting the prescribed frequency 360.degree. by means of the phase shifting circuits 10C and 30C and setting the open loop gain of a feedback loop at less than 1 when the output of the voltage dividing circuit 160 is feedback. The resistance ratio between the feedback resistor 70 and the input resistor 74 of each section 2, 3 is adjusted so that the maximum damping of each section 2, 3 may become smaller and the tuning bandwidth of each section 2, 3 becomes wider. Therefore, since the two tuning amplifier sections are cascade-connected, the maximum damping is increased and the tuning bandwidth is widened as a whole.
摘要:
A tuning circuit which has a wide tuning bandwidth. The tuning bandwidth of the tuning frequency can be easily changed. The tuning circuit 1 is composed of two cascade-connected tuning amplifier sections 2 and 3. Each of the sections 2 and 3 is provided with cascade-connected phase-shifting circuits 10C and 30C, a voltage dividing circuit 60, and an adding circuit composed of a feedback resistor 70 and an input resistor 74. Prescribed tuning operation is performed by shifting the phase of a prescribed frequency by 360.degree. by means of the phase shifting circuits 10C and 30C and setting the open loop gain of a feedback loop at less than 1 when the output of the voltage dividing circuit 60 is feedback. The resistance ratio between the feedback resistor 70 and input resistor 74 of each tuning amplifier section is adjusted in order that the maximum damping of each tuning amplifier section becomes smaller and the tuning bandwidth of each amplifier section becomes wider. Therefore, since the tuning amplifier sections are cascade-connected, the maximum damping is increased and the tuning bandwidth is widened as a whole.
摘要:
A keyboard section 9, whose operation keys are allocated linearly in a longitudinal direction on the cylinder chassis 1, is established except for at the location of the grip section 1a, which is held by the user when the cylinder chassis 1 is used as a writing tool. Due to this, the area of the operation keys of the keyboard section 9 can be large. And for the operation keys to be allocated linearly can preserve a great deal of space for the display section 3.
摘要:
An inductor element 10 effectively functions even when formed on a substrate and comprises two upper and lower conductors 1, 2 spirally formed on the front side of a semiconductor substrate 3. The conductors 1, 2 have substantially the same shape. When viewed from the above of the front side of the substrate 3, the two conductors 1, 2 are superposed one on the other almost exactly. Lead wires 6a, 6b are connected to the outer end (outer peripheral end) and the inner end (center end) of the conductor 1, respectively. The outer end of the conductor 1 is connected to the inner end of the conductor 2 through a connection wire 6c. The conductor 1 functions as an inductor conductor and is connected to a circuit provided on the semiconductor substrate 3 through the lead wires 6a, 6b.
摘要:
A variable inductance element comprising an inductor conductor 10 having a predetermined shape formed on an insulation layer 40 on the surface of a semiconductor substrate 42, switches 16 and 24 for shorting portions of the inductor conductor 10, and input/output terminals 12 and 14 provided at the respective ends of the inductor conductor 10. When switches 16 and/or 24 is in the on state, the function as an inductor having a smaller inductance than the overall inductor conductor 10 is obtained. The inductance of this variable inductance element can be changed by external control, while manufacturing is easy and formation in a unitized manner with an integrated circuit or other semiconductor device is enabled.
摘要:
In a mixer circuit 6 connected in common to output sides of an LNA 2 for FM receiving and an LNA 4 for AM receiving, each of a radiofrequency signal output from the LNA 2 for FM receiving and a radiofrequency signal output from the LNA 4 for AM receiving is frequency-converted into an intermediate frequency signal of a lower intermediate frequency for AM broadcast waves. In this way, receiving of an FM broadcast is performed by a low IF system and receiving of an AM broadcast is performed by a single conversion system; the need for separately providing a mixer circuit, a local oscillation circuit and an IF filter for down-mixing of AM broadcast waves is eliminated.
摘要:
A cellular phone with an AM radio, which can reduce noises, as might otherwise be mixed into the output audio of the AM radio. A cellular phone 100 comprises a cellular phone unit 10 for performing a waiting processing, a line connecting processing and a speech processing, which are performed by transmitting/receiving electric waves between itself and a base station, an AM radio tuner section 20 for receiving the AM radio broadcasts and outputting a demodulated audio signal, and a control section 40 acting as telephone function stopping unit for stopping the operations of the cellular phone unit 10 when the AM radio tuner section 20 is operating.
摘要:
A keyboard section 9, whose operation keys are allocated linearly in a longitudinal direction on the cylinder chassis 1, is established except for at the location of the grip section 1a, which is held by the user when the cylinder chassis 1 is used as a writing tool. Due to this, the area of the operation keys of the keyboard section 9 can be large. And for the operation keys to be allocated linearly can preserve a great deal of space for the display section 3.