摘要:
There is provided a step attenuator having two Pi-type attenuators and one bridged-T type attenuator that share some resistors. The step attenuator is used to prevent a reduction in frequency range caused by use of MOS transistors and reduce attenuation of signal power and frequency band by the MOS transistors, thereby obtaining a low attenuation value and reducing input and output mismatch.
摘要:
There is provided a step attenuator having two Pi-type attenuators and one bridged-T type attenuator that share some resistors. The step attenuator is used to prevent a reduction in frequency range caused by use of MOS transistors and reduce attenuation of signal power and frequency band by the MOS transistors, thereby obtaining a low attenuation value and reducing input and output mismatch.
摘要:
There is provided a bias current generating apparatus capable of providing a bias current where a characteristic change is compensated, to one of an analog circuit and RF circuit where various characteristic changes occur according to a temperature, by generating bias currents having a plurality of temperature coefficients. The apparatus includes: a positive temperature coefficient current generator generating a positive temperature coefficient current in direct proportion to an absolute temperature; a zero temperature coefficient current generator generating a zero temperature coefficient current constant regardless of the absolute temperature; and an adjustable temperature coefficient current generator generating and outputting an adjustable temperature coefficient current by amplifying the positive temperature coefficient current by A times, amplifying the zero temperature coefficient current by B times, adding the two amplified temperature coefficient currents, wherein a temperature coefficient of the adjustable temperature coefficient current is varied by adjusting sizes of the A and B.
摘要:
There is provided a bias current generating apparatus capable of providing a bias current where a characteristic change is compensated, to one of an analog circuit and RF circuit where various characteristic changes occur according to a temperature, by generating bias currents having a plurality of temperature coefficients. The apparatus including: a positive temperature coefficient current generator generating a positive temperature coefficient current in direct proportion to an absolute temperature; a zero temperature coefficient current generator generating a zero temperature coefficient current constant regardless of the absolute temperature; and an adjustable temperature coefficient current generator generating and outputting an adjustable temperature coefficient current by amplifying the positive temperature coefficient current by A times, amplifying the zero temperature coefficient current by B times, adding the two amplified temperature coefficient currents, wherein a temperature coefficient of the adjustable temperature coefficient current is varied by adjusting sizes of the A and B.
摘要:
A received signal strength indicator according to an aspect of the invention may include a gain calibration section including a calibration limiter, a calibration load unit and a comparison and adjustment unit. The calibration load unit is connected to output terminals of the calibration limiter, and generating an output differential voltage whose gain is a unit gain when a predetermined input differential voltage is input to the calibration limiter, and a comparison and adjustment unit comparing the input differential voltage with the output differential voltage, and adjusting an output of a variable current source included in the calibration limiter so that the input differential voltage becomes identical to the output differential voltage.
摘要:
Provided is a current sampling mixer that can be applied to a broadband broadcasting system. The current sampling mixer can change a structure of a current sampler including a plurality of capacitors to select and sum capacitors having a weight value given in the output, thereby performing a finite impulse response filter function and a harmonic rejection function.
摘要:
Provided is a tuning circuit of a Gm (transconductance)-C (capacitance) filter. The tuning circuit tunes a transconductance using direct current incorporating variations of a capacitance, instead of a clock signal, in a Gm tuning mode, while using the clock signal in a capacitance tuning mode. As such, it is possible to prevent deterioration of a received signal caused by the clock signal.
摘要:
An integrated tracking filter includes: an amplifying unit having first to third terminals, the first terminal being connected to an input stage and the second terminal being connected to an output stage, and amplifying a signal from the input stage; a loading unit connected between a power source stage and the second terminal of the amplifying unit; a current source connected between the third terminal of the amplifying unit and a ground; and a switched LC filter unit connected between the third terminal of the amplifying unit and the ground and varying a pass band of the signal.
摘要:
Provided is a current sampling mixer that can be applied to a broadband broadcasting system. The current sampling mixer can change a structure of a current sampler including a plurality of capacitors to select and sum capacitors having a weight value given in the output, thereby performing a finite impulse response filter function and a harmonic rejection function.
摘要:
Provided is a tuning circuit of a Gm (transconductance)-C (capacitance) filter. The tuning circuit tunes a transconductance using direct current incorporating variations of a capacitance, instead of a clock signal, in a Gm tuning mode, while using the clock signal in a capacitance tuning mode. As such, it is possible to prevent deterioration of a received signal caused by the clock signal.