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Transistorized Frequency Doubler

IP.com Disclosure Number: IPCOM000097266D
Original Publication Date: 1962-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Dersch, WC: AUTHOR

Abstract

This transistorized frequency doubler operates according to the multiplication of a sine wave by another sine wave having a phase shift of 180 degrees.

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Transistorized Frequency Doubler

This transistorized frequency doubler operates according to the multiplication of a sine wave by another sine wave having a phase shift of 180 degrees.

Resistors 10, 11, 15, 16, 20 and 21 are equal in value, approximately 1,000 ohms. Load resistor 5 is approximately 10,000 ohms. The input signal is applied at terminals 17 and 18 across resistor 19. The fundamental frequency of this signal appears at point 9 and is applied through resistor 10 to base 7 of transistor 1.

At the same time the signal is applied from point 9 through resistor 11 to emitter 8 of transistor 2.

The phase shift circuit, including resistor 21 and capacitor 22, provides a phase shifted signal at point 14. This signal is applied to base 12 of transistor 2 through resistor 15 and emitter 13 of transistor 1 through resistor 16.

The coaction of the signal at bases 7 and 12 together with the phase shifted signal at emitters 13 and 8 provides an output at collectors 3 and 4 which is the product of two sine waves. Since this product is always negative, the result is a sine wave of doubled frequency at terminal 6.

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