As 5G is rapidly growing, wireless communication systems require wideband, compact and highly efficient power amplifier modules (PA) to drive the base station antenna arrays. Doherty PAs are implemented in most base stations. The final stage in these power amplifier modules has high supply voltages (28-50 V) to generate a high output power of >20 W at reasonable output impedance levels. This work replaces the ‘classical’ single-ended cascode PA to drive the Doherty PA, with a series push-pull (or totem-pole) PA to increase the efficiency and bandwidth of the driver. The series push pull designs can reach peak efficiencies of 70.7%, which is about 10 percentage points higher than the efficiency of the single-ended PA. To ensure that a fair comparison is made between the designs, the series push-pull designs operate at 5 V and 10 V supply, in order to generate an output voltage swing of 5 V and 10 V respectively. This is compared to the single-ended PA with a 5 V supply and 10 V output swing. Simulation results show that the series push-pull design does indeed increase the efficiency of the driver whilst having minimal AM-AM distortion (<1 dB) at the design frequency of 3.6 GHz.