Single-transistor all-pass networks

All‐Pass Filters

“…Rubin and Even extended the results in Ref. 9 to include higher order all-pass transfer functions with complex poles, but inductors are employed (11). Figure 15 shows two first-order all-pass circuits based on operational amplifiers (op-amps) (12,13, also see Active filters).…”

A Millimeter-Wave Second-Order All-Pass Delay Network in BiCMOS

“…The following design procedure is followed: (i) Design equations from [12] are used for initial component values neglecting layout parasitics ( ) (ii) An optimization is performed in simulation using the foundry PDK and initial values. C3 is minimized without compromising decoupling, while C2 is optimized to reduce high-frequency peaking.…”

“…where , is the delay Q-value, is the center frequency of the second-order all-pass delay function and is the corresponding peak-to-nominal group delay. Equating similar terms in (2) with those in [12] leads to: ,…”

“…A suitable single transistor second-order all-pass network with inductor Q-factor enhancement was proposed in [12], but the published synthesis method relies on zero length interconnects and ideal components. In MMICs, the circuit's design would be complicated by layout RLC parasitics and finite component Q-factors.…”

“…In this work, we present an MMIC second-order all-pass response with a QD-value larger than 1 for the first time, through augmentation of the procedure in [12] with an optimizationbased, layout-focused design methodology which incorporates accurate device models as well as layout-specific RC parasitic extraction. The effects of component tolerances on the group delay and magnitude responses are further investigated.…”