摘要:
On a circuit-board intended for constant-wire-length (CWL) bonding, one or more special "test" pairs of bonding pads are provided along with, in each case, a series of markings adjacent the pads. In use, the board is populated with CWL bonds (this includes the normal circuit-related RF bond-pads as well as the test bond-pads) and the test bonds are distorted so that the bond-wires in question lie aligned against the markings. The alignment position relative to the markings indicates whether the bond-wires for the whole board are of correct or incorrect length. Measurement may be either absolute, in which case the markings are associated with a scale indication, or relative, in which case one of the markings will usually be visibly distinguished from the rest in some way. Depending on the length determination, the bond-forming device (e.g. ball and wedge) is adjusted so as to reduce any difference between the indicated length and the desired length when the next board is populated or when the next multi-board production run takes place.
摘要:
An adhesive-dispensing method applies a pattern of adhesive onto a circuit-board carrier such that any discontinuities in the pattern, i.e. starting points, end-points or turning-points, are outside a footprint of a pair of substrates (11,12) or MMICs intended to be attached, adjacent each other and spaced apart, to the circuit-board, and in particular outside such footprint in the area of transition between one substrate/MMIC (11) and the other (12). The adhesive is preferably applied in straight lines and in a direction substantially transverse to the direction of transition (20) between the two substrates/MMICs (11,12).
摘要:
A frequency-generator circuit employs the same circuit element (preferably a varactor) to perform the functions of parametric frequency-divider and frequency-adjustment element for an oscillator used to pump the parametric frequency-divider.The varactor preferably has a flat gamma-characteristic (gamma preferably > 2) over a required bias-voltage adjustment range corresponding to the required frequency-adjustment range.