Wideband frequency divider

US4730349A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Wilhelm Wilhelm · Munich, DE
• Zafer Incecik · Munich, DE

Key dates

• Filing date: Jan 20, 1987
• Grant date: Mar 8, 1988
• Expiry date: Jan 20, 2007

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K3/289
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A bipolar clock-controlled bistable multivibrator circuit arrangement having a static memory cell formed of a D-master-slave flip-flop with a first inverted output signal fed back to a data input and with feedback loops, respectively, for intermediately storing output signals of the master and the slave. A dynamic memory cell is formed of the D-master-slave flip-flop with a second inverted output signal fed back to the data input. The second inverted output signal has gate propagation times performing intermediate memory functions in place of the feedback loops and includes a synchronizing device connected between the static and the dynamic memory cells. Means are provided for setting the circuit of the static memory cell in operation at relatively high clock frequencies. Thereby the useful frequency range of the multivibrator is at least doubled.