The Puzzler - June 2009

Amplifiers/Semiconductors

Across

4 The vector ratio of voltage to current, the reciprocal of admittance
9 Wideband gap III-V material used to produce broadband, high power amplifiers
11 Undesired changes in a waveform that result in spurious content of the signal
14 A device or impedance that terminates the output of a device
15 Loss of signal resulting from the insertion of a device in a transmission line (2 words)
16 Material typically used to produce high frequency, broadband PIN diodes
17 PA return loss under actual output drive levels (2 words)
18 Energy at integral multiples of the frequency of the fundamental signal
21 The ratio of the input signal to noise ratio to the output signal to noise ratio for a circuit or system (2 words)
23 The process of varying the impedance seen by the output of an active device to other than 50 ohms in order to measure performance parameters (2 words)
24 Measure of how much of the input power is usefully applied to the amplifier’s output
25 The amount of power at which the amplitude of the output of a device or circuit is reduced by 1 dB from the expected small-signal gain

Down

1 Laterally diffused metal oxide semiconductor
2 Range of frequencies for which the amplifier gives “satisfactory performance”
3 The amount of electrical power converted to heat by a device (2 words)
5 The state of operation in which there is no interruption of the presence of a signal (2 words)
6 Undesired signals present at the output of a device under test that are neither harmonics nor intermodulation products
7 At a given point in a transmission system, the difference between the incident and reflected power (2 words)
8 The ratio between the amplitude of the output signal of a device or circuit compared to the amplitude of the input signal
10 Technique used to improve the linearity of amplifiers
12 The degree to which the impedance of a component differs from the transmission line or component to which it is connected
13 Amplifier class where the output filter blocks all harmonics to achieve very high efficiencies (2 words)
19 Amplifier configuration where the carrier amplifier is biased to operate in Class AB mode and the peaking amplifier is biased to operate in Class C mode to achieve higher efficiency
20 Metal Electrode Leadless Face package used for PIN diodes
22 Amplifier class widely used in SSB linear amplifier applications where low-distortion and high power-efficiency tend to both be very important (2 words)