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EL4451 Datasheet(PDF) 9 Page - Elantec Semiconductor |
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EL4451 Datasheet(HTML) 9 Page - Elantec Semiconductor |
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9 / 12 page  EL4451C Wideband Variable-Gain Amplifier Gain of 2 Applications Information Contd Leveling Circuits Often a variable-gain control is used to normalize an input signal to a standard amplitude from a modest range of possible input amplitude A good example is in video systems where an untermi- nated cable will yield a twice-sized standard vid- eo amplitude and an erroneously twice-terminat- ed cable gives a 23-sized input Here is a g6 dB range preamplifier Linearized Leveling Amplifier 4451 – 30 In this arrangement the EL4451 outputs a mix- ture of the signal routed through the multiplier and the REF terminal The multiplier port pro- duces the most distortion and needs to handle a fraction of an oversized video input whereas the REF port is just like an op-amp input summing into the output Thus for oversized inputs the gain will be decreased and the majority of the signal is routed through the linear REF terminal For undersized inputs the gain is increased and the multiplier’s contribution added to the output Here are some component values for two designs Attenuation RF RG R1 R2 R3 b 3dB Ratio Bandwidth 15 200 X 400X 300X 100X 200X 47 MHz 2 400 X 400X 500X 100X 200X 28 MHz EL4451 Leveler Circuit Attenuation Ratio e 15 4451 – 31 EL4451 Leveler Circuit Attenuation Ratio e 2 4451 – 32 With the higher attenuation ratio the multiplier sees a smaller input amplitude and distorts less however the higher output gain reduces circuit bandwidth As seen in the next curves the peak differential gain error is 047% for the attenua- tion ratio of 15 but only 027% with the gain of 2 constants To maintain bandwidth an external op amp can be used instead of the RF -RG divid- er to boost the EL4451’s output by the attenua- tion ratio Sinewave Oscillators Generating a stable low distortion sinewave has long been a difficult task Because a linear oscil- lator’s output tends to grow or diminish continu- ously either a clipping circuit or automatic gain control (AGC) is needed Clipping circuits gener- ate severe distortion which needs subsequent fil- tering and AGC’s can be complicated 9 |
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