Ultra Low Power Bioelectronics
RF Cafe Quiz #24

This quiz is based on the information presented in Ultra Low Power Bioelectronics: Fundamentals, Biomedical Applications, and Bio-Inspired Systems, by Rahul Sarpeshkar, published by Cambridge University Press.

 Note: Some of these books are available as prizes in the monthly RF Cafe Giveaway.

1.  Which formula represents what is known as "1/f" noise?

a)  1/f

b)  1/fⁿ

c)  f^∞

d)  1/f^∞

2.  What is Return Ratio Analysis?

a)  An investment strategy for tech companies

b)  A method for analyzing circuit robustness in response to changes in gain or impedance

c)  The electrical equivalent of a mass/damper mechanical system

d)  A measure of current reflection

3.  What is the name of the process used to simplify analysis of a complex system when

     an additional passive element is added in parallel?

a)  A Norton equivalent system theorem

b)  Kirchhoff's law for parallel elements

c)  Middlebrook's extra-element theorem

d)  Cascoded elements theory

4.  What function does a gyrator circuit perform?

a)  Inverts impedance (changes L to C, or C to L)

b)  Creates a circulating current in a tank circuit

c)  Drives a gyroscope at a predetermined speed

d)  Converts DC to AC

5.  What is a key feature of a neuron-inspired analog-to-digital converter?

a)  Brain-like logic

b)  Small size comparable to neurons

c)  A concept though of while using the inventor's brain's neurons

d)  Energy efficiency

6.  What does the Bode-Fano criterion state?

a)  All circuit responses can be represented on a Bode plot

b)  All circuit responses can be represented on a Bode-Fano plot

c)  All response can be reduced to a single passive and single active element

d)  For passive loads (series or parallel RC or RL), there is an inverse relationship between good

     impedance matching at a single frequency and good matching across the entire band

7.  Which type of biomedical implant is not likely to employ a wireless link to an external transceiver?

a)  Cardiac pacemaker

b)  Cochlear implant

c)  Hair plug

d)  Retinal implant

8.  Which curve in the graph to the right represents

     skin depth in biological tissue?

a)  A

b)  B

c)  C

d)  D

9.  What is the approximate power consumed by the average

     human male brain, consisting of 22 billion neuronal cells?

a)  1.5 kW

b)  15 W

c)  1 W

d)  15 mW

10.  Name the three regions of current-dependent battery polarization as a function of voltage

a)  Active, ohmic, concentration

b)  Active, ohmic, jeopardy

c)  Passive, active, inverse

d)  Inverse, proverse, null

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