Superimposing circuit module for reducing spurious electromagnetic wave emissions and small variations in circuit parameters

摘要

A small-sized superimposed circuit module has reduced spurious electromagnetic wave emission and small variations in circuit parameters. A resonance circuit portion of an oscillator and a portion of a noise rejection filter are embedded in a multilayer ceramic substrate, and the remaining circuit components are mounted on the surface of the multilayer substrate. The upper surface of the multilayer substrate is covered with a metal case.