Abstract
Active inductors are suitable for MMIC integration, especially for filters applications, and the definition of strategies for an efficient design of these circuits is becoming mandatory. In this work we present design considerations for the reduction of DC current in the case of an active filter design based on the use of active inductors and for high-power handling. As an example of applications, the approach is demonstrated on a two-cell, integrated active filter realized with p-HEMT technology. The filter design is based on high-Q active inductors, whose equivalent inductance and resistance can be tuned by means of varactors. The prototype was realized and tested. It operates between 1800 and 2100 MHz with a 3 dB bandwidth of 30 MHz and a rejection ratio of 30 dB at 30 MHz from the center frequency. This solution allows to obtain a P1 dB compression point of about −8 dBm and a dynamic range of 75 dB considering a bias current of 15 mA per stage.
Highlights
On-chip passive filters are affected by the limited Q-factor of inductors and capacitors, due to ohmic and substrate losses, even on low-loss substrates as Gallium Arsenide
Active filters can be realized with several approaches [1,2,3]; many of them are usually based on active inductors (AIs), that can achieve very low or even negative equivalent resistance, and a high filter Q
We presented an innovative design approach for the minimization of the bias current in the AI-based active filters
Summary
On-chip passive filters are affected by the limited Q-factor of inductors and capacitors, due to ohmic and substrate losses, even on low-loss substrates as Gallium Arsenide. We present a design approach of integrated active inductor and its applications in filters realized in GaAs technology that allows the minimization of bias current, still maintaining. The voltage gener e capacitor is sampled by the inverting transconductance amplifier, that draws an indu ent from the input of the active inductance. This is certainly a feasible approach that inverting transconductance amplifier, given the highofoperation In cause this improved topology, significantly reduces the DC power requirements the filter,frequencies. Even if it may some concerns on the amplifier is a fixed-bias, class-A linearisamplifier, stable and with fixed gain This approach not always possible, depending on theThe characteristics of phase and amplitude is; performed by the phase-shifting passive network that includes the active device. Inductive, or nearly so, that is,implements with a 90 degree phase relation with the voltage it
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