Page 294 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits

Conversion gain is Iless than that of the sample-and-hold mixer, but the noise

performance is very good.
80th mixers аге harmonic mixers, and а band-pass ог low-pass filter is required оп
the path of the inputs. Otherwise, the output of these mixers will "тар" noise and
RF signals from out of the radio band of interest.
References

1. U.S. Patent 1,855,576, Clyde R. Keith, "Frequency Translating System," filed оп

April 9, 1929.
2. U.S. Patent 2,086,601, Robert S. Carutheгs, "Mod'ulating System," filed оп Мау
3, 1934.
З. U.S. Patent 2,025,158, Fгапk Augustus Соwап, "Моdulаtiпg System," filed оп
June 7, 1934.

4. U.S. Patent 5,471,531, Ronald Quan, "Method and Apparatus (ог Low-Cost Audio
ScгambIing and DescгambIing," filed оп ОесетЬег 14, 1993.
S. Кеппеth К. Clarke апd Dопаld Т. Hess, Communication Circuits: Ana/ysis апd
Design. Reading: Addison-Wesley, 1971.
6. Keith Неппеу, Radio Engineering Handbook, 3rd ed. New York: МсGгаw-НiII,

1941.
7. Allan R. НатЫеу, E/ectrica/ Engineering Princip/es and App/ications, 2nd ed.
Upper Saddle Riveг: Pгentice Hall, 2002.
8. Robert L. Shrader, E/ectronic Communication, 6th ed. New York:
GlепсоеjМсGгаw-НiII, 1991.

9. Mischa Schwartz, Information, Transmission, and Noise. New York: МсGгаw-НiII,
1959.
10. Harald S. Black, Modu/ation Theory. Princeton: О. Van Nostrand Сатрапу,
1953.

11. В. Р. Lathi, Linear Systems and Signa/s. Caгmichael: Berkeley Cambridge Pгess,
2002.
12. Alan V. Oppenheim and Alan S. Wilsky, with S. Hamid Nawab, Signa/s and
Systems, 2nd ed. Upper Saddle River: Prentice Hall, 1997.
13. Магу Р. Dolciani, Simon L. Bergman, and William Wooton, Modern A/gebra and

Trigonometry. New York: Houghton Мiffliп, 1963.
14. William Е. Воусе and Richard С. DiPrima, E/ementary Differentia/ Equations and
Boundary Va/ued ProbIems. New York: Jahn Wiley & Sons, 1977.
15. Murray Н. Pratter and Charles В. Маггеу, Jr., Modern Mathematica/ Ana/ysis.

Reading: Addison-Wesley, 1964.
16. Е. В. Saff and А. О. Snider, Fundamenta/s of Соmр/ех Ana/ysis (ог Mathematics,
Science, and Engineering, 2nd ed. Upper Saddle River: Prentice Hall, 1993.