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  2. Double-tuned amplifier - Wikipedia

    en.wikipedia.org/wiki/Double-tuned_amplifier

    A double-tuned transformer from a radio receiver intermediate-frequency amplifier with its screening can removed. A double-tuned amplifier is a tuned amplifier with transformer coupling between the amplifier stages in which the inductances of both the primary and secondary windings are tuned separately with a capacitor across each.

  3. Impedance matching - Wikipedia

    en.wikipedia.org/wiki/Impedance_matching

    Note, , the reactance in parallel, has a negative reactance because it is typically a capacitor. This gives the L-network the additional feature of harmonic suppression since it is a low pass filter too. The inverse connection (impedance step-up) is simply the reverse—for example, reactance in series with the source.

  4. Tuned radio frequency receiver - Wikipedia

    en.wikipedia.org/wiki/Tuned_radio_frequency_receiver

    One of the windings of the transformer had a variable capacitor connected across it to make a tuned circuit. A variable capacitor (or sometimes a variable coupling coil called a variometer) was used, with a knob on the front panel to tune the receiver. The RF stages usually had identical circuits to simplify design.

  5. Transformer - Wikipedia

    en.wikipedia.org/wiki/Transformer

    Perfect coupling implies infinitely high core magnetic permeability and winding inductance and zero net magnetomotive force (i.e. i p n p − i s n s = 0). [3] [c] Ideal transformer connected with source V P on primary and load impedance Z L on secondary, where 0 < Z L < ∞. Ideal transformer and induction law [d]

  6. Power dividers and directional couplers - Wikipedia

    en.wikipedia.org/wiki/Power_dividers_and...

    The coupling factor is defined as: , = ⁡ where P 1 is the input power at port 1 and P 3 is the output power from the coupled port (see figure 1). The coupling factor represents the primary property of a directional coupler.

  7. Leakage inductance - Wikipedia

    en.wikipedia.org/wiki/Leakage_inductance

    Fig. 1 L P σ and L S σ are primary and secondary leakage inductances expressed in terms of inductive coupling coefficient under open-circuited conditions.. The magnetic circuit's flux that does not interlink both windings is the leakage flux corresponding to primary leakage inductance L P σ and secondary leakage inductance L S σ.

  8. Short-circuit inductance - Wikipedia

    en.wikipedia.org/wiki/Short-circuit_inductance

    Other transformer parameters like leakage inductance and mutual inductance which cannot be directly measured may be defined in terms of k. Short-circuit inductance is one of the parameters that determines the resonance frequency of the magnetic phase synchronous coupling in a resonant transformer and wireless power transfer.

  9. Network synthesis - Wikipedia

    en.wikipedia.org/wiki/Network_synthesis

    The corollary problem, to find a synthesis of PRFs using R and C elements with only one inductor, is an unsolved problem in network theory. [31] Another unsolved problem is finding a proof of Darlington's conjecture (1955) that any RC 2-port with a common terminal can be realised as a series-parallel network. [ 32 ]