Abstract
A novel reconfigurable non-Foster capacitance (NFC) using negative group delay (NGD) circuit is presented in this paper. The NGD circuit is based on a multi-order distributed amplifier which is used to achieve both NGD performance and gain compensation. By introducing shunt and series varactors next to trans-conductance transistors in the amplifier, the characteristic impedance, and electric length of transmission lines in the distributed amplifier can be flexibly tuned. As a result, the gain, phase shift, and negative group delay value of the proposed NGD circuit can be easily controlled as desired, and therefore, the scattering parameters S 21 can be adjusted to match with an ideal NFC, resulting in reconfigurable non-Foster capacitance. The working frequency ranges, equivalent negative capacitance value, and connection modes of the NFC be fully reconfigured by appropriately controlling the voltages applied to the varactors. Both simulation and measurement results were given, which agree well with each other. The experimental results show that the NFC value can be tuned from -1.1 to -2.5pF with 1 GHz center frequency and the working frequency can be tuned from 0.7 to 0.8 GHz with -10 pF shunt NFC.
Highlights
For the wideband signal, the transmission phase is distinct at different frequencies, and this phenomenon is called group delay
Yang: Novel Fully Reconfigurable Non Foster Capacitance Using Distributed Negative Group Delay Networks with negative capacitance and the non-Foster inductor with negative inductance. Among these two types of NF reactive elements, non-Foster capacitance (NFC) circuits have been used in a variety of applications to improve system performance
The last transmission section Port 3 or Port 4 consists of a transmission line TL1 and a shunt varactor C11, which have same values as in the first negative group delay (NGD) cell
Summary
The transmission phase is distinct at different frequencies, and this phenomenon is called group delay. With negative capacitance and the non-Foster inductor with negative inductance Among these two types of NF reactive elements, NFC circuits have been used in a variety of applications to improve system performance. THE PRINCIPLE OF EQUIVALENT NON FOSTER CAPACITANCE USING DISTRIBUTED NGD CIRCUIT Fig. 1 shows the schematic of proposed reconfigurable NFC circuit. It consists of an N th order distributed amplifier with varactors. The last transmission section Port 3 or Port 4 consists of a transmission line TL1 and a shunt varactor C11, which have same values as in the first NGD cell.
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