Integrated wide bandwidth attenuating-and-amplifying circuit
A circuit and amplifier technology, applied in the field of integrated wide-bandwidth attenuation and amplification circuits, can solve the problems of increased thermal noise and increased power consumption of attenuators
Inactive Publication Date: 2006-11-15
AGILENT TECH INC
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Problems solved by technology
A problem with this technique is that the thermal noise of the attenuator increases due to the additional active device, the attenuation transistor
Another problem is that the amplification transistors of differential pair amplifiers need to be connected to very large degeneration resistors in order to obtain low distortion even for the largest input signals.
Also, this technique requires a large supply voltage due to the increased power dissipation due to the additional active devices and the large voltage drop across the degeneration resistor
Method used
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[0014] refer to figure 1 , describing an integrated wide bandwidth attenuation and amplification circuit 100 according to an embodiment of the present invention. In most cases, attenuation and amplification circuit 100 operates to selectively adjust overall gain or attenuation to produce a voltage-adjusted output signal of an input signal. However, the attenuation and amplification circuit 100 can also produce an output signal that is identical in voltage to the input signal. The design of the attenuation and amplification circuit 100 allows the circuit to be fabricated on a single silicon integrated circuit (IC) chip using bipolar or bipolar complementary metal oxide semiconductor (BiCMOS) technology, which addresses the problems associated with the use of non-integrated attenuators. Some problems, such as increased cost and increased board area. Furthermore, the design of the attenuation and amplification circuit 100 requires a lower power supply than an equivalent convent...
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An attenuating-and-amplifying circuit and method for producing a voltage-adjusted output signal of an input signal uses a voltage divider and a number of switchable amplifier units connected to the voltage divider to adjust the gain or attenuation of the input signal. The voltage divider includes a number of tapping nodes, which are connected to the switchable amplifier units. The voltage divider is configured to provide different voltage attenuated signals of the input signal. The switchable amplifier units can be selectively activated to adjust with respect to voltage at least one of the different voltage attenuated signals to produce the voltage-adjusted output signal.
Description
technical field [0001] The invention relates to an attenuation and amplification circuit and a method of producing a voltage regulated output signal of an input signal. Background technique [0002] Attenuators and amplifiers are frequently used in analog signal processing equipment to adjust the overall gain of a high speed analog signal path. For example, an attenuator can be used on an oscilloscope's input channel to provide an attenuated version of the input signal, which can then be amplified for signal processing. In a given analog signal processing device, the attenuator may or may not be integrated with an amplifier, typically fabricated on a silicon integrated circuit (IC) using bipolar or bipolar complementary metal-oxide-semiconductor (BiCMOS) technology. part of a high-speed mixed-signal processing system on a chip. [0003] In conventional gain-reduction techniques of interest using non-integrated attenuators, the attenuators are based on resistive voltage div...
Claims
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IPC IPC(8): H03F3/72
CPCH03F3/45085H03F3/45183H03F3/72H03F2200/258H03F2200/261H03F2200/78H03F2203/45504H03F2203/45506H03G1/0088H03K17/60G01R13/22G01R15/04H03G3/00H03G3/04H03K17/005H03K17/6264
Inventor 贝恩德·武佩曼
Owner AGILENT TECH INC