center tap

(redirected from Center-tapped transformers)

center tap

[′sen·tər ‚tap]
(electricity)
A terminal at the electrical midpoint of a resistor, coil, or other device. Abbreviated CT.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Matching Networks for Testing Center-tapped Transformers Z ratio, 1:[N.sup.2] Rs (Figure 10) Rp (Figure 10) Loss of Network, dB 1:1 0.866 Rt 0.683 Rt 8.43 1:1.5 0.791 Rt 1.291 Rt 6.31 1:2 0.707 Rt 2.414 Rt 4.64 1:2.5 0.612 Rt 5.56 Rt 3.18 1:3 0.500 Rt None 1.76 1:4 1.333 Rt 2.000 Rt 6.53 1:5 1.887 Rt 1.581 Rt 8.23 1:8 3.44 Rt 1.265 Rt 11.08 1:13 5.97 Rt 1.140 Rt 13.60 1:16 7.47 Rt 1.109 Rt 14.61 1:25 11.98 Rt 1.066 Rt 16.71 RF TRANSFORMERS WIDEBAND 4kHz to 1400MHz [Omega] FREQUENCY INSERTION LOSS [E] RATIO MHz MODEL Note 3 dB NO.
It adds a transmission-line transformer in cascade at the input, to convert an unbalanced signal to balanced at the input to the center-tapped transformer. Features of this design:
Amplitude balance, sometimes called "unbalance", is the absolute value of the difference in signal amplitude, in dB, between the two outputs of a center-tapped transformer using the center tap as a ground reference.
Like the ring mixer, it uses RF and LO center-tapped transformers. However, instead of a diode ring, it uses a diode star, which consists of four diodes radiating from a common connection point.