Abstract:
PROBLEM TO BE SOLVED: To form a filter with large attenuation using a gmC filter on a MOS integrated circuit substrate. SOLUTION: The filter 11 comprises the gmC filter 13 which comprises a plurality of mutual conductance amplifiers gm1, gm2, ..., and capacitors C1, C2, ..., and has a characteristic to pass a signal of a special bandwidth; a LPF 12 which has a characteristic to attenuate a signal of high side of a stop bandwidth, and a HPF 14 which has a characteristic to attenuate a signal of low band side of a stop bandwidth. Since the filter 11 is composed as stated above, it is possible to form a band pass filter in which attenuation in the stop bandwidth is large, on the MOS integrated circuit substrate. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To reduce the unevenness of the gain of a detection circuit formed on a MOS integrated circuit. SOLUTION: N-channel MOS transistors Q1, Q2 are connected at sources to resistors R1, R2. R1=R2=R is set. The mutual conductance gm of the MOS transistors Q1, Q2 and a resistance value R are set to satisfy the relation of 1/gm≪R. Thus, the drain currents of the MOS transistors Q1, Q2 are obtained by the ratio of an input signal to the resistance value R. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a ring oscillator type voltage controlled oscillator of which duty ratio of an output signal is about 50 percentages. SOLUTION: Circuit parts 101, 102, 103 being stages of a ring oscillator circuit 100 respectively comprise: variable current sources I1, I2, I3; MOS transistors Q1, Q2, Q3; and bias resistors R1, R2, R3. Capacitors C1, C2, C3 are provided between the circuit parts and charged/discharged by turning ON/OFF of the transistors Q1, Q2, Q3. Further, the circuit configuration of a bias circuit 20 is selected similar to the circuit configuration of the circuit parts 101, 102, 103 being the stages of the ring oscillator circuit 10 to bring the duty ratio of an output signal of the ring oscillator type voltage controlled oscillator to about 50 percentages. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To surely solder a semiconductor part on a land which is so small that solder is printed only on the backside of the semiconductor part when the semiconductor part which is not sufficiently heat-resistant and not allowed to be introduced into a reflow furnace is mounted on a circuit board with high mounting density. SOLUTION: The semiconductor part 1 equipped with metal terminals 2 formed on its backside is mounted on a circuit board 5 bringing only the backsides of the metal terminals 2 into contact with cream solders 3, and the sides of the metal terminals 2 are irradiated with a laser beam to heat the backsides of the metal terminals 2 through heat conducted from the backsides of the metal terminals 2, whereby the cream solders 3 coming into contact with the backsides of the metal terminals 2 are melted to solder the metal terminals 2. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a low noise amplifier capable of suppressing noise with a small number of components and of amplifying a signal with a high gain, and further to provide a low noise amplifier with a CMOS structure capable of lowering noise and signal distortion. SOLUTION: This low noise amplifier has a semiconductor substrate (810A and 810) having at least two crystalline planes and a gate insulating film (820A) formed on the semiconductor substrate to at least two crystalline planes, wherein the channel width of channels respectively formed in the semiconductor substrate along the gate insulating film is shown by the total sum of respective channel width of the channels respectively formed to at least two crystalline planes. The low noise amplifier uses a CMOS transistor (800) obtained by combining a p channel MOS transistor (840A) and an n channel MOS transistor (840B) to suppress noise to a low level, amplifying an input signal. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To ensure a high gain of a limiter circuit. SOLUTION: A rectangular parallelepiped protrusion 21 having height H B and width W B is formed on a silicon substrate and a gate oxide film is formed partially on the top surface and the side wall face of the protrusion 21. A source and a drain are formed on the opposite sides of a gate electrode 26 thus fabricating an MOS transistor. A differential amplifier circuit consisting of MOS transistors 61 and 62 constitutes the limiter circuit. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract translation:要解决的问题:确保限制电路的高增益。 解决方案:在硅衬底上形成具有高度H B SB>和宽度W SB SB的长方体突起21,并且栅极氧化膜部分地形成在顶表面 和突起21的侧壁面。源极和漏极形成在栅电极26的相对侧上,从而制造MOS晶体管。 由MOS晶体管61和62组成的差分放大器电路构成限幅电路。 版权所有(C)2005,JPO&NCIPI