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telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 1 (11) 2-ghz single balanced mixer description the u2796b-fp is a 2-ghz down conversion mixer for telecommunication systems, e.g. cellular radio, ct1, ct2, dect, pcn, using telefunken advanced bipo- lar technology. the u2796b is well suited for the receiver portion of the rf circuit. single balanced structure has been chosen for the best noise performance and low cur- rent consumption. the iip3 is programmable. features supply voltage range: 2.7 to 5.5 v exellent isolation characteristics low current consumption: 3.2 ma without r ip3 iip3 programmable input frequency operating range up to 2 ghz rf characteristic nearly independent of supply voltage benefits stand alone product low current consumption extends talk time 3-v operation requires small space for batteries block diagram duty cycle control loop buffer mixer voltage regulator e bp 2 3 rf 5 4 if s v 6,8 7 lo 1 93 7758 e i c i o if o b figure 1.
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 2 (11) pin description 1 2 3 4 5 6 7 8 gnd v s rf i bp c if o lo i if o gnd 93 7820 e figure 2. pin symbol function 1 v s supply voltage 2 rf rf input and iip3 programming port 3 bp c by-pass capacitor 4 ifo if output 5 ifo if output 6 gnd ground 7 lo i local oscillator input 8 gnd ground absolute maximum ratings parameters symbol value unit supply voltage pin 1 v s 6 v input voltage pins 2, 3, 4, 5 and 7 v i 0 to v s v junction temperature t j 125 c storage temperature t stg 40 to + 125 c operating range parameters symbol value unit supply voltage range pin 1 v s 2.7 to 5.5 v ambient temperature t amb 40 to + 85 c thermal resistance parameters symbol value unit junction ambient so 8 r thja 175 k/w
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 3 (11) electrical characteristics test conditions (unless otherwise specified): v s = 3 v, f lo = 900 mhz; i m = 1.2 ma, t amb = 25 c. system impedance z o = 50 w parameters test conditions / pin symbol min. typ. max. unit supply voltage pin 1 v s 2.7 5.5 v supply current r ip3 = , pin 1 i s 2.8 3.2 3.7 ma conversion power gain rl = 3 k w , r ip3 = f lo = 900 mhz pg c 9 db figure 4 f lo = 1700 mhz f if = 45 mhz 9 isolation lo-spurious at rf in pi lo = 10 dbm figure 5 pin 7 to 2 is lorf 35 dbm rf to lo pi rf = 25 dbm pin 2 to 7 f lo = 900 mhz is rflo 30 40 db figure 6 f lo = 1700 mhz 20 operating frequencies rf frequency pin 2 rf i 2000 mhz lo in frequency pin 7 lo i 2000 mhz if out frequency pins 4 and 5 if o 300 mhz input level rf input ( 1 db comp.) rl = 50 w , pin 2 pi rf 15 dbm 3rd order intercept point pi lo = 10 dbm, r ip3 = figure 2 pin 2 iip3 4 dbm lo input pin 7 p ilo 6 0 dbm impedances rf input pin 2 z irf 25 w lo input pin 7 zi lo 50 w if output pins 4 and 5 z oif 10 k w // 0.9 pf noise figure (dsb) pi lo = 0dbm, rl 3 k w f lo = 900 mhz nf 50 9 db figure 7 f lo = 1700 mhz 12 voltage standing wave ratio lo pin 7 vswr- lo 1.3 2 note: i m = internal mixer current (see figure 2)
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 4 (11) 0 400 800 1200 1600 1.0 1.5 2.0 2.5 3.0 3.5 i ( ma ) m re ( ) 2000 93 7825 e figure 3. mixer current (i m ) versus re 12 7 4 1 2 5 8 iip3 ( dbm ) i m ( ma ) 3 93 7827 e figure 4. third-order input intercept iip3 point versus i m lo buffer lo 7 3 2 e r if 54 rf m i 93 7759 e i o i figure 5. mixer circuitry
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 5 (11) 8765 1234 c 2 3 c ip3 r 1 spectrum analyzer hp 70908 a r = 50 i n c 4 1 c lo r = 50 i 10 db lo 10 db i 1. rf generator r = 50 10 db 10 db i 2. rf r = 50 rf power splitter s v r c u2796b 93 7760 e 1 f = 958.5 mhz f = 900 mhz lo f = 958.55 mhz 2 10 dbm 26 dbm h i i if o if o generator generator figure 6. test circuit-conversion power gain (pg c ) and 3rd order input intercept point (iip3)
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 6 (11) 8765 1234 c 2 3 c 1 c lo generator r = 50 i 10 db 10 dbm lo 10 db u2796b i spectrum analyzer r = 50 rf s v 4 c 93 7761 e i i if o if o figure 7. test circuit-isolation lo to rf 8765 1234 c 2 3 c ip3 r c 4 1 c lo generator r = 50 i 10 db lo 10 db s v u2796b rf 15 to 5 dbm 26 dbm 10 db nwa, e r = 50 i power splitter i nwa, s r = 50 93 7762 e h i i if o if o figure 8. test circuit-isolation rf to lo
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 7 (11) 8765 1234 c 2 3 c ip3 r n c 4 1 c lo generator r = 50 i lo s v r c u2796b noise source rf noise figure meter 93 7763 e if o if o i i figure 9. test circuit-noise figure note: 1. the noise floor of the lo generator might influence the noise figure test result. in order to avoid this, either a band pass or a high pass filter with fc f if should be implemented. 2. if if output network does not provide sufficient suppression of the lo component, a low pass filter should be inserted to avoid overdriving the noise figure meter. 3. for best noise performance 0 dbm lo power level is required.
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 8 (11) 94 7840 e figure 10. s11 rf input impedance 94 7841 e figure 11. s11 lo input impedance
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 9 (11) application circuit 8765 1234 c 2 3 c ip3 r n c 4 1 c lo s v r c u 2796 b rf 2 r 93 7765 e if out i i if o if o figure 12. recommended values for the evaluator c 1 and c 2 = 150 pf, c 3 and c 4 = 100 nf. c r is calculated for resonance with the balun at f if, or as a high pass filter for f lo. the output balun transformer ratio = 8:1 for z o = 50 w . r 2 increases the if output level and is calculated from: r 2 v s ( 4, 5 ) v s ( 1 ) i s ( 1 ) for example v s (4,5) = 4 v, v s (1) = 3 v, i s (1) = 2.2 ma r 2 470 w , where i s (1) is the current consumption with- out the mixer stage. application hint the output transformer at the pins 4 and 5 can be replaced by lc-circuits like one of the following proposals, which are saving space compared to the transformer and are suit- able for higher if frequencies. when applying one of these solutions, it has to be checked whether the require- ments on noise figure and gain can be achieved. the second circuit was dimensioned for approximately 130 mhz and a load resistance of 50 . if for instance the impedance of a subsequent filter is 1 k , the capacitive voltage divider may be left out. v s v s l 2 l 1 c 2 c 1 c 2 r 4 5 v s 5 r l = 50 39 pf 1 h 220 nh 8.2 pf 10 pf 4 95 9632 figure 13.
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 10 (11) evaluation board 93 7826 e r ip3 figure 14. dimensions in mm so 8 package 94 8862
telefunken semiconductors u2796b-fp rev. a1: 23.02.1995 11 (11) ozone depleting substances policy statement it is the policy of temic telefunken microelectronic gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( odss). the montreal protocol ( 1987) and its london amendments ( 1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. temic telefunken microelectronic gmbh semiconductor division has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2 . class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency ( epa ) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c ( transitional substances ) respectively. temic can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. we reserve the right to make changes to improve technical design and may do so without further notice . parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use temic products for any unintended or unauthorized application, the buyer shall indemnify temic against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. temic telefunken microelectronic gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 ( 0 ) 7131 67 2831, fax number: 49 ( 0 ) 7131 67 2423

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