Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
An amplifier circuit arrangement,comprising two amplifier devices (5, 6) connected together to provide a push-pull output and biased so as to operate in Class AB or B characterised in that each amplifier device (5, 6) has a respective and separately transformer-coupled driving circuit (28, 20; 28A, 20A), such that when an input current is applied to one of the amplifier devices (e.g.5) through its respective driving circuit (28, 20) substantially none of the current is applied to the other amplifier device (e.g.6).
Claim 2
Dependent Claim
82 words
An amplifier circuit arrangement,comprising two amplifier devices (5, 6) connected together to provide a push-pull output and biased so as to operate in Class AB or B characterised in that each amplifier device (5, 6) has a respective and separately transformer-coupled driving circuit (28, 20; 28A, 20A), such that when an input current is applied to one of the amplifier devices (e.g.5) through its respective driving circuit (28, 20) substantially none of the current is applied to the other amplifier device (e.g.6).
Claim 3
Dependent Claim
93 words
An arrangement according to claim 1, characterised in that each driving circuit includes a respective transformer (20; 20A) having its secondary winding (22; 22A) connected to drive the respective one of the two amplifier devices (5, 6) and its primary winding (26; 26A) connected to receive, in anti-phase with the primary winding (22; 22A) of the other transformer (20; 20A) and through a respective impedance (28; 28A), the input signal to be amplified, the windings of each transformer (20; 20A) not being inductively coupled with the windings of the other transformer (20; 20A).
Claim 4
Dependent Claim
51 words
An arrangement according to claim 2, characterised in that the input impedance at the primary winding (22, 22A) of each transformer (5, 6) varies with increasing frequency of the input signal and the impedance (28; 28A) through which each primary winding (5, 6) is energised is frequency-dependent so as to compensate.
Claim 5
Dependent Claim
28 words
An arrangement according to any preceding claim, characterised in that the two amplifier devices are respective high power bi-polar transistors (5, 6) having their outputs connected in push-pull.
Claim 6
Dependent Claim
20 words
An arrangement according to any preceding claim, characterised by a radio transmitter connected to be driven by the push-pull output.